arkivoAPI
Menu

Monitors / Compare

ASUS ROG Swift OLED PG27UCWM vs LG UltraGear evo GX9 39GX950B

Product A: ASUS

ROG Swift OLED PG27UCWM

116 of 172 known
Change ASUS ROG Swift OLED PG27UCWM

Compare the LG UltraGear evo GX9 39GX950B with

Product B: LG

UltraGear evo GX9 39GX950B

104 of 172 known
Change LG UltraGear evo GX9 39GX950B

Compare the ASUS ROG Swift OLED PG27UCWM with

89 of 164 fields differ

Download CSVDownload JSON
  • 53 different values
  • 36 known for one only
  • 34 the same
  • 41 missing for both

Biggest differences

Each bar uses the scale of all 179 monitors.

  1. Power use HDR (EU label)Lower is betterA: 27WB: 45.9WASUS is 18.9 W lower.
  2. Power use SDR (EU label)Lower is betterA: 25.3WB: 40.3WASUS is 15 W lower.
  3. Peak brightness (HDR)A: 1,000nitsB: 1,500nitsLG is 500 nits higher.
  4. Refresh rateA: 240HzB: 165HzASUS is 75 Hz higher.
  5. Brightness (typical, SDR)A: 250nitsB: 335nitsLG is 85 nits higher.
  6. ContrastA: 1,500,000:1B: 1,850,000:1LG is 1.2 times higher.
  7. Pixel densityA: 166.3ppiB: 142.5ppiASUS is 23.8 ppi higher.

Refresh rate per resolution

The best rate over any port. Bars run from 0 to 1200 Hz.

5120 × 2160Native for B
ANot listed
B165Hz
3840 × 2160Native for A
A240Hz
B165Hz
2560 × 1080
ANot listed
B330Hz
1920 × 1080
A480Hz
B330Hz

Size, drawn to scale

Front and side. Solid lines show the stand at its lowest. Dashed lines show it at its highest.

Weight

0 to 15 kg

Weight with stand
A8.1kg
B10.7kg
Weight without stand
A5.4kg
B6.8kg
Box weight
A11.8kg
B16.2kg

All 172 fields

Every value links to where we found it.

AASUS ROG Swift OLED PG27UCWM
BLG UltraGear evo GX9 39GX950B

General

7 of 8 differ
Series
ROG Swift OLED1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Exact model header on the maker's global spec page.
UltraGear evo GX91Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own product title.
Model numbers
PG27UCWM, 90LM0CY1-B019711Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Header names PG27UCWM. The ordering code 90LM0CY1-B01971 is in the page data of the same product. The ASUS US store sells ordering code 90LM0CY0-B019B1, which is not stored because the maker pages do not show it as a different configuration.
39GX950B-B1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own U.S. SKU, matching exact manual cover.
GTIN / EAN
47116365058579Retailer pagegrosbill.com/asus-rog-swift-pg27ucwm-169893Read 14 October 2026EAN 4711636505857 for manufacturer reference 90LM0CY1-B01971. hinta.fi lists the same EAN and code. No UPC found for the US ordering code.
1951741464911Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Exact own AllInfo Warranty UPC. Regional Japanese JAN code is not inherited.
Announced
4 January 20267Press releaserog.asus.com/ca-en/articles/gaming-monitors/rgb-stripe-pixel-oled-tech-debuts-in-the-rog-swift-pg34wcdn-xg34wcdms-pg27ucwmRead 14 October 2026Maker CES article dated 4 January 2026 introduces the PG27UCWM. It gives no price or date and says the monitors are on their way.
Not available
Status
Available8Maker product pageeshop.asus.com/us/90lm0cy0-b019b1-rog-swift-oled-pg27ucwm.htmlRead 14 October 2026ASUS US store lists the exact model as in stock and for sale at 1,199 USD (current store price, not a launch MSRP).
Not available
Predecessor
Not available
Not available
Successor
Not available
Not available
Launch price (US)
Not available
$1,799.9911Press releaselg.com/us/newsroom/media-entertainment/game-on-lg-kicks-off-pre-orders-for-ultragear-evo-gx9-and-gm9-gaming-monitorsRead 5 October 2026April 7, 2026 maker U.S. preorder release explicitly own 39GX950B-B $1799.99. Optional warranty extension excluded. Price does not itself prove retail availability.
Launch price (EU)
€1,249.911Reviewguru3d.com/review/asus-rog-swift-oled-pg27ucwm-240-480-hz-gaming-monitor-reviewRead 14 October 2026Page 1: recommended price 1,249.90 EUR including VAT, written as an approximate European recommended price. Tom's Hardware gives 1,099 USD as a starting price while the ASUS US store sells at 1,199 USD, so no USD price is stored.
Not available
Markets
US, EU8Maker product pageeshop.asus.com/us/90lm0cy0-b019b1-rog-swift-oled-pg27ucwm.htmlRead 14 October 2026US from the ASUS US store, EU from the EPREL registration and European retailers.
Not available
Colours
Black3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026Specifications table Chassis Colors Black.
Not available
Segment
Gaming1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Maker Gaming Monitors category.
Gaming1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own maker gaming monitor classification.

Display

11 of 12 differ
Screen size
26.5in(67.3 cm)1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Panel Size (inch) 26.5. EPREL gives 67.3 cm, which is the same diagonal.
39in(99.1 cm)1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Exact U.S. AllInfo 39-inch class. Japanese own base-model table separately gives precise 38.86-inch viewable panel.
Viewable screen diagonal
Not available
38.86in(98.7 cm)3Maker product pagelg.com/jp/monitors/gaming-monitors/39gx950b-bRead 5 October 2026Own original 39GX950B-B technical table precise 38.86-inch panel, corroborated current producer catalogue. U.S. 39-inch class and Spanish 38.6-rounded label are less precise.
Native resolution
3840 × 2160px1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026
5120 × 2160px1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own AllInfo native 5120 x 2160. Not older 39-inch WQHD hardware.
Aspect ratio
16:91Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026
21:91Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Maker nominal 21:9 class. The exact pixel ratio 64:27 is different.
Pixel density
166.3ppi
142.5ppi
Pixel pitch
0.153mm1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Pixel Pitch 0.153 mm as published. The published active area divided by 3840 x 2160 gives about 0.1536 mm, so the maker's figure looks truncated. Stored as published.
0.1776mm1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own horizontal and vertical 0.1776 mm, independently original Japanese base-model table. Active area 909 x 384 fits this published precision.
Active display area
Width589.97Height331.7mm(23.2 × 13.1 in)1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Display Viewing Area (HxV) 589.97 x 331.70 mm, listed here as width x height. The manual's pixel format line says 26.5 inch (674.0 mm), which is a smaller diagonal than this area implies, so the area is stored as the maker page states it.
Width909Height384mm(35.8 × 15.1 in)3Maker product pagelg.com/jp/monitors/gaming-monitors/39gx950b-bRead 5 October 2026Own base-model technical table active 909 x 384 mm. Independent catalogue agrees. These are published whole-mm values, not inferred from pitch.
Curved
No11Reviewguru3d.com/review/asus-rog-swift-oled-pg27ucwm-240-480-hz-gaming-monitor-reviewRead 14 October 2026Page 3: the display is completely flat. No curvature radius is published.
Yes1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own Curved Yes.
Curvature radius
Not available
1,500mm1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own 1500R curvature. Fixed, not a bendable screen.
Screen surface
Glossy1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Display Surface Glossy (TrueBlack Glossy).
Matte8Reviewtechradar.com/computing/monitors/lg-ultragear-evo-39gx950b-b-reviewRead 5 October 2026Own exact model Design section explicitly matte finish. No numerical reflections or unstated brightness measurement inferred.
Anti-reflection coating
TrueBlack Glossy2Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwmRead 14 October 2026TrueBlack Glossy zero-haze optical layer with an anti-reflective stack. Exact maker name stored.
Not available
Touchscreen
Not available
Not available

Panel

15 of 31 differ
Panel type
WOLED1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Panel Type WOLED.
WOLED6Reviewrtings.com/monitor/reviews/lg/39gx950b-bRead 5 October 2026Public own 39GX950B-B Differences Between Sizes table explicitly fourth-gen WOLED/Tandem OLED. The old 45-inch row has incorrect bandwidth and is not inherited. Numeric locked results are omitted.
Panel type (as published)
Tandem RGB OLED1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Panel Technology Tandem RGB OLED.
Tandem OLED6Reviewrtings.com/monitor/reviews/lg/39gx950b-bRead 5 October 2026Own public introduction and producer original Japanese page identify Tandem OLED. Not RGB-stripe technology from another monitor using a related panel.
Backlight
None (self-emissive)3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026Product is OLED, which is self-emissive. The manual spec table labels the Backlight Type row as RGB stripe, which is a pixel layout and is not stored as a backlight.
None (self-emissive)2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 20 expressly says own OLED pixels emit their own light without a backlight.
Local dimming
Not available
Not available
Dimming zones
Not available
Not available
Panel maker
LG Display10Press articletftcentral.co.uk/news/asus-unveil-the-rog-swift-pg27ucwm-with-a-27-4k-tandem-woled-panel-and-rgb-stripe-pixel-layoutRead 14 October 2026Names LG Display as the panel maker. The panel model number is not given.
LG Display7Reviewpcgamer.com/hardware/gaming-monitors/lg-ultragear-evo-gx9-39gx950b-reviewRead 5 October 2026Exact review expressly distinguishes LG Display as panel maker from LG Electronics as monitor maker.
Panel part number
Not available
Not available
Panel generation
4th Gen Primary RGB Tandem WOLED10Press articletftcentral.co.uk/news/asus-unveil-the-rog-swift-pg27ucwm-with-a-27-4k-tandem-woled-panel-and-rgb-stripe-pixel-layoutRead 14 October 2026Names a 4th Gen Primary RGB Tandem WOLED panel, which LG Display now calls Tandem WOLED.
4th-generation Tandem OLED6Reviewrtings.com/monitor/reviews/lg/39gx950b-bRead 5 October 2026Own public 39-inch row, independently original producer Japanese feature. No fifth-generation or Alienware RGB-stripe panel facts inherited.
Subpixel layout
RGB stripe2Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwmRead 14 October 2026States true RGB Stripe sub-pixel arrangement and removal of the white subpixel of standard WOLED.
Not available
Colour depth
10bits1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Display Colors 1073.7M (10 bit).
Not available
Colour depth method
Native12Reviewtomshardware.com/monitors/gaming-monitors/asus-rog-swift-pg27ucwm-27-inch-4k-oled-gaming-monitor-reviewRead 14 October 2026Spec table row Native Color Depth and Gamut: 10-bit / DCI-P3. The maker page says 10 bit without the word native.
Not available
Displayable colours
1.07 billion1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Published as 1073.7M. Normalized to 1.07 billion.
1.07 billion1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own 1.07B. Native/FRC panel method and accepted per-mode input bit depth remain unproved.
sRGB coverage
Not available
Not available
DCI-P3 coverage
99%1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Color Space (DCI-P3) 99%. The manual says 99% (Typ.). The reference chromaticity is not stated. The 130% sRGB figure is gamut volume and is not stored as coverage.
99.5%1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own DCI-P3 coverage 99.5%, CIE 1976. Not gamut volume or measured coverage.
Adobe RGB coverage
Not available
Not available
Rec. 2020 coverage
Not available
Not available
NTSC coverage
Not available
Not available
Factory calibrated
Yes2Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwmRead 14 October 2026FAQ says ROG OLED monitors are factory calibrated. Spec page lists a Color Calibration E-report through DisplayWidget Center. Tom's Hardware confirms factory calibration data stored in firmware. No paper report is stated.
Yes1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own Factory Calibration Yes. U.S. paper report not proved and omitted.
Claimed Delta E
22Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwmRead 14 October 2026Feature banner reads 99% DCI-P3 and Delta E under 2. Stored as 2 with the less-than qualifier. Average or maximum is not stated.
23Maker product pagelg.com/jp/monitors/gaming-monitors/39gx950b-bRead 5 October 2026Own feature claims ΔE<=2, CIE DE2000 across all 125 Intertek colour-fidelity patterns. Stored upper bound, not measured average or exact equality. Picture preset and calibration procedure unstated.
Paper calibration report in box
Not available
Not available
Hardware calibration support
Not available
Yes1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own H/W Calibration True Color Pro Yes. Manual calibrated profiles use LG Calibration Studio.
Static contrast ratio
1,500,000:11Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Contrast Ratio (Typ.) 1,500,000:1.
1,850,000:11Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own static 1850000:1. No finite measured value invented for black OLED pixels.
Brightness (typical, SDR)
250nits1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Brightness (Typ.) 250 cd/m2. The manual spec table adds 450 nits (peak) without a condition, which is not stored.
335nits1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own 335 cd/m² typical SDR. No full-screen mode claim inferred.
Brightness (maker minimum)
Not available
300nits1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own 300 cd/m² maker minimum guarantee, not minimum adjustable luminance.
Peak brightness (HDR)
1,000nits1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Brightness (HDR, Peak) 1,000 cd/m2. The page note says peak brightness may vary due to color pre-calibration. The test window is not stated on the maker page and is left out.
1,500nits1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own 1500 cd/m² HDR at 1.5% APL. Separate 600 cd/m² at 10% APL claim is not stored in a real-scene or full-screen field.
HDR peak test window
Not available
1.5%1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own 1.5% average picture level. White-window stimulus is not assumed.
Full-screen brightness
250nits12Reviewtomshardware.com/monitors/gaming-monitors/asus-rog-swift-pg27ucwm-27-inch-4k-oled-gaming-monitor-reviewRead 14 October 2026Spec table Brightness (mfr) 250 nits full screen and 1,000 nits at a 3% window. The panel maker figures quoted by TFTCentral are 1,000 nits at 1.5% APL for HDR peak and 250 nits at 100% APL, so the peak window is stated two ways and is not stored.
Not available
HDR formats
HDR10, Dolby Vision1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026HDR Support lists HDR10 and Dolby Vision as two rows. HDR10+ is not listed by the maker.
HDR101Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own HDR10 Yes. No other format inferred.
HDR certification
DisplayHDR True Black 4001Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Certificate list VESA DisplayHDR 400 True Black.
DisplayHDR True Black 5001Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own DisplayHDR True Black 500, not LCD DisplayHDR 500.
Viewing angle (horizontal)
178°1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Viewing Angle (CR 10 or more) 178 / 178.
178°1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own 178 degrees R/L.
Viewing angle (vertical)
178°1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Viewing Angle (CR 10 or more) 178 / 178.
178°1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own 178 degrees U/D.

Refresh rate and motion

12 of 22 differ
Refresh rate per resolution and port
AASUS ROG Swift OLED PG27UCWM
Refresh rate per resolution and port. The top rate is in bold.
ResolutionHDMI 2.1DisplayPort 2.1a UHBR20USB-C
3840 × 2160Native240Hz240Hz240Hz
1920 × 1080480Hz480Hz480Hz
Source2Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwmRead 14 October 2026Feature page: DisplayPort 2.1a UHBR20 with full 80 Gbps supports 4K at 240 Hz without compression. Dual Mode switches between 4K at 240 Hz and FHD at 480 Hz. Maker spec page Signal Frequency gives 48 to 240 Hz vertical for HDMI, USB-C and DisplayPort at native resolution. The manual says Frame Rate Boost enables up to 1920 x 1080 at 480 Hz, and its timing table lists 3840 x 2160 at 240 Hz and 1920 x 1080 at 480 Hz as accepted on HDMI and on DP and USB-C. Bit depth, chroma and DSC for HDMI and USB-C are not stated. The manual's Type-C Bandwidth setting limits USB 3.2 mode to 3840 x 2160 at 120 Hz, so the USB-C maxima need the other bandwidth setting. HDMI 4K at 240 Hz needs a signal beyond uncompressed 48 Gbps, so no DSC value is stored for it.
BLG UltraGear evo GX9 39GX950B
Refresh rate per resolution and port. The top rate is in bold.
ResolutionHDMI 2.1DisplayPort 2.1 UHBR20USB-C
5120 × 2160Native165Hz165Hz165Hz
3840 × 2160165Hz165Hz165Hz
2560 × 1080330Hz330Hz330Hz
1920 × 1080330Hz330Hz330Hz
Source2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 17 explicitly limits Dual Mode Off (Full Wide) to native 5120 x 2160 at 165 Hz, Off (16:9) to 3840 x 2160 at 165 Hz, On (Full Wide) or On (21:9 34-inch) to 2560 x 1080 at 330 Hz, and On (16:9), On (16:9 27-inch) or On (16:9 24.5-inch) to 1920 x 1080 at 330 Hz. Own HDMI pages 22-23 and combined DisplayPort/USB-C pages 24-25 accept matching signals. The explicit ceilings and input support together establish maxima, rather than presets alone. HDMI native mode requires 2.1(PC). DP native mode supports 2.1 or 1.4 compatibility, with 2.1 DisplayPort only. USB-C needs compatible host/cable and optimized-resolution preference where necessary. Page 25 requires a DSC-capable GPU for preferred timing. Exact per-mode compression, depth and chroma are unstated and omitted.4Maker spec sheet (PDF)lg.com/content/dam/channel/wcms/jp/catalog/pdf/202606_monitor_ultragear.pdfRead 5 October 2026Page 4 connector maximum-resolution table explicitly native 165 Hz for HDMI, DP and USB-C, plus WFHD 330 Hz for HDMI/DP. These original catalogue rows corroborate core hardware. Additional cropped 4K, FHD and USB-C WFHD modes come from explicit ceilings in own U.S. manual page 17 joined to matching input support on pages 22-25. The catalogue native USB-C row does not explicitly exclude lower-resolution Dual Mode. No per-mode bit depth, chroma or compression state inferred.
Max refresh rate
480Hz
330Hz
Max refresh rate at native resolution
240Hz
165Hz
Max refresh rate over DisplayPort
240Hz
165Hz
Max refresh rate over HDMI
240Hz
165Hz
Max refresh rate over USB-C
240Hz
165Hz
Max refresh rate at 10-bit
Not available
Not available
Native refresh rate
240Hz1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Refresh Rate (max) 240 Hz at the native 3840 x 2160. The 480 Hz mode is the Full HD dual mode.
165Hz1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own 165 Hz at native 5K2K. Faster 330 Hz needs lower-resolution Dual Mode.
Overclocked refresh rate
Not available
Not available
Dual mode
Yes1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Dual Mode Yes, 4K at 240 Hz or FHD at 480 Hz.
Yes1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own direct 5K2K 165 / WFHD 330 paired claim and dedicated manual button.
Minimum fixed refresh rate
Not available
Not available
Adaptive sync technologies
Adaptive-Sync, VESA AdaptiveSync Display, FreeSync Premium Pro, G-SYNC Compatible1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026VRR Technology Yes (Adaptive-Sync). Certificate list names AMD FreeSync Premium Pro, G-SYNC Compatible and VESA AdaptiveSync Display. The ASUS US store page lists G-SYNC Compatible and VESA AdaptiveSync Display 480Hz but not FreeSync Premium Pro.
FreeSync Premium Pro, G-SYNC Compatible, VESA AdaptiveSync Display1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own FreeSync Premium Pro, G-SYNC Compatible and VESA Adaptive Sync. Original Japanese base-model feature explicitly VESA AdaptiveSync Display certification. No native G-SYNC module inferred.
VRR range per port
AASUS ROG Swift OLED PG27UCWM
Min (Hz)Max (Hz)
48240
48480
Source3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026Gaming menu, Variable Refresh Rate: can only be activated within 48 to 240 Hz when Frame Rate Boost is off and 48 to 480 Hz when Frame Rate Boost is on. The manual does not split the range by port, so no input is stored. First row is Frame Rate Boost off, second row is on.
BLG UltraGear evo GX9 39GX950B
InputMin (Hz)Max (Hz)
HDMI48165
DisplayPort48165
Source3Maker product pagelg.com/jp/monitors/gaming-monitors/39gx950b-bRead 5 October 2026Own table explicitly separates native VRR 48-165 Hz and Dual Mode 48-330 Hz for HDMI/DP. Stored rows describe native Full Wide/Dual Mode off only. Schema cannot distinguish resolution modes. USB-C generic scan range does not prove its VRR interval.
Low framerate compensation
Yes15Maker product pageamd.com/en/resources/support-articles/faqs/DH3-013.htmlRead 14 October 2026AMD defines FreeSync Premium Pro as supporting low framerate compensation. The maker lists AMD FreeSync Premium Pro for this model. A compatible GPU and enabled mode are required.
Yes13Maker product pageamd.com/en/products/graphics/technologies/freesync.htmlRead 5 October 2026Official AMD makes LFC mandatory for producer-confirmed FreeSync Premium Pro. No unproved input-specific interval inferred.
Response time (maker GtG claim)
0.03ms1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Response Time 0.03 ms (GTG). The announcement calls it a minimum GTG response time.
0.03ms1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own 0.03 ms GtG claim, not mean measured response. Exact setting for this claim is unstated.
Response time (maker MPRT claim)
Not available
Not available
Overdrive settings
Not available
Not available
Motion blur reduction
Yes1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Extreme Low Motion Blur Yes.
Not available
Blur-reduction technology
Extreme Low Motion Blur (ELMB)3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026Gaming menu ELMB Setup. The spec page names it Extreme Low Motion Blur.
Not available
Blur reduction works with VRR
No3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026ELMB can only be activated when Variable Refresh Rate is off, and enabling ELMB turns VRR off. ELMB is available at 120 Hz, or at 120 and 240 Hz in Frame Rate Boost mode.
Not available
Flicker-free (claimed)
Yes1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Flicker free Yes. TUV Flicker-free is on the certificate list.
Yes5Maker product pagelg.com/uk/monitors/ultragear-evo/39gx950b-bRead 5 October 2026Own Tandem OLED feature explicitly UL Flicker-Free Display A196009. VRR flicker is separate.
Black frame insertion
Not available
Not available

Measured

2 of 12 differ
Input lag at maximum refresh rate
Not available
Not available
Input lag at 60 Hz
Not available
Not available
Average response time (measured)
Not available
Not available
Overshoot (measured)
Not available
Not available
Contrast ratio (measured)
Not available
Not available
SDR brightness (measured)
278nits13Measurementtomshardware.com/monitors/gaming-monitors/asus-rog-swift-pg27ucwm-27-inch-4k-oled-gaming-monitor-review/3Read 14 October 2026Page 3: Racing mode, Power Setting on Performance, brightness slider at maximum, Uniform Brightness on. Full field 278 nits, and the 25% window also read 278 nits. With Uniform Brightness off a 25% window reached just under 500 nits. Guru3D measured lower SDR maxima (229.6 nits at 100% in sRGB Calibration mode) with default settings. The ASUS manual says the default Power Saving mode limits brightness.
Not available
HDR brightness in a real scene (measured)
Not available
Not available
PWM flicker frequency (measured)
Not available
Not available
VRR range (measured)
Not available
Not available
Colour accuracy (measured Delta E)
1.0514Measurementtomshardware.com/monitors/gaming-monitors/asus-rog-swift-pg27ucwm-27-inch-4k-oled-gaming-monitor-review/4Read 14 October 2026Page 4: Racing picture mode, uncalibrated, Calman gamut test, 1.05 dE average color gamut error. The Delta E formula is not stated on the page. Guru3D measured an average 2.37 in Racing mode with a DataColor Spyder, a different instrument and patch set, so the two are not the same test.
Not available
Gray uniformity (measured)
Not available
Not available
Reflections (measured)
Not available
Not available

Connectivity

7 of 19 differ
Video inputs
AASUS ROG Swift OLED PG27UCWM
TypeVersionCountMax bandwidth (Gbps)
DisplayPort2.1a UHBR20180
HDMI2.1248
USB-CNot available1Not available
Source2Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwmRead 14 October 2026Rich Connectivity: DisplayPort 2.1a UHBR20 with full 80 Gbps, HDMI 2.1 FRL 48 Gbps. Counts from the manual I/O line: HDMI v2.1 x2, DisplayPort v2.1 x1, USB Type-C x1. DSC and HDCP are not stored.
BLG UltraGear evo GX9 39GX950B
TypeVersionCountMax bandwidth (Gbps)DSC
DisplayPort2.1 UHBR20180Yes
HDMI2.12Not availableNot available
USB-CNot available1Not availableYes
Source1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Own AllInfo DP 2.1 one, HDMI 2.1 two, USB-C one. Japanese original base-model table explicitly DP UHBR20 and public exact 39-inch review table 80 Gbps. Own manual separately proves DP/USB-C DSC capability. API alone does not establish compression. Port-specific HDCP, HDMI bandwidth and USB-C link revision are unproved and omitted.2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 25 combined DisplayPort/USB-C table requires a DSC-capable graphics card for preferred timing and frequency. This proves compression capability on those inputs. It does not identify compression operation, depth or chroma for each stored mode. HDMI compression capability remains unknown.6Reviewrtings.com/monitor/reviews/lg/39gx950b-bRead 5 October 2026Own 39-inch free differences table explicitly UHBR20/80 Gbps. Original producer Japanese base-model UHBR20 confirms. Other product rows and protected port measurements are excluded.
HDMI ports
2
2
DisplayPort ports
1
1
Highest HDMI version
2.1
2.1
Highest DisplayPort version
2.1a UHBR20
2.1 UHBR20
HDMI features
Not available
VRR2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 17 supported interface explicitly HDMI VRR. Other HDMI feature names unproved.
USB-C video (DP Alt Mode)
Yes1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026I/O Ports USB-C x 1 (DP Alt Mode).
Yes2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 13 explicitly supports PD and DisplayPort Alternate Mode through USB-C. The adapter powers the monitor itself.
USB-C power delivered
90W1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026USB-C Power Delivery 90 W.
90W1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own 90 W supplied to compatible host. Monitor still needs separate DC adapter.
Thunderbolt
Not available
Not available
USB upstream ports
AASUS ROG Swift OLED PG27UCWM
ConnectorUSB versionCount
USB-B3.2 Gen 11
USB-CNot available1
Source3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026Back view and I/O line: USB Type-B x1, USB 3.2 Gen 1 upstream. The Type-C port also carries USB data to a host (Type-C Bandwidth setting offers USB 2.0 or USB 3.2, and Smart KVM selects it). No USB revision is stated for the Type-C connection.
BLG UltraGear evo GX9 39GX950B
ConnectorCount
USB-C1
Source1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own USB upstream via USB-C, one socket. Revision unstated in the own U.S. upstream row.
USB downstream hub ports
AASUS ROG Swift OLED PG27UCWM
ConnectorUSB versionCount
USB-A3.2 Gen 13
Source3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026I/O line USB Type-A (5V / 0.9A) x3. Back view lists them as USB 3.2 Gen 1 downstream ports.
BLG UltraGear evo GX9 39GX950B
ConnectorUSB versionCount
USB-A3.2 Gen 22
Source1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own two peripheral ports explicitly USB 3.2 Gen 2. Matching physical Type-A sockets. Manual data speed depends on USB-C preference and compatible host.
KVM switch
Yes1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026KVM Switch Yes.
Not available
Daisy chain (MST)
Not available
Not available
Ethernet
No3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026The complete I/O line has no Ethernet port.
No2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Complete own rear connector inventory has only HDMI, DP, USB-C, USB-A, headset and DC. No RJ45.
3.5 mm headphone output
Yes1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Earphone jack Yes. Tom's Hardware names it as a 3.5 mm jack.
Yes3Maker product pagelg.com/jp/monitors/gaming-monitors/39gx950b-bRead 5 October 2026Own original base-model stereo-mini headset socket. Producer catalogue footnote 5 expressly 3.5 mm, four-pole sound+mic.
3.5 mm microphone input
No3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026The complete back view and I/O line list only an earphone jack for audio. No microphone input.
Yes3Maker product pagelg.com/jp/monitors/gaming-monitors/39gx950b-bRead 5 October 2026Same shared four-pole 3.5 mm headset jack, not a separate microphone socket. Manual page 14 requires upstream USB connection to PC for microphone.
Optical out
No3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026The complete I/O line has no optical or S/PDIF output.
No2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Complete own rear connector inventory has no optical audio socket.
Picture in picture
Yes3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026OSD PIP/PBP menu has PIP Size (Small, Middle, Large). PIP/PBP turns off VRR, ELMB, Aspect Control and DSC.
Yes1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own PIP Yes, manual input-pairing table.
Picture by picture
Yes3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026OSD PIP/PBP Mode selects the split screen type, and Smart KVM enables PBP automatically.
Yes1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own PBP Yes, supplementary maker specifies 2PBP.

Smart features

None of 4 known
Smart platform
Not available
Not available
Wi-Fi
Not available
Not available
Bluetooth
Not available
Not available
Remote control
Not available
Not available

Audio and camera

3 of 5 differ
Speakers
No1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Speaker No.
Yes1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Own exact U.S. AllInfo Speaker Yes. Exact TechRadar Design paragraph separately proves two physical internal speakers.
Number of speakers
Not available
28Reviewtechradar.com/computing/monitors/lg-ultragear-evo-39gx950b-b-reviewRead 5 October 2026Exact own-model Design paragraph explicitly states two internal 7 W speakers. This counts physical speakers, rather than inferring count from channels.
Speaker power per channel
Not available
7W3Maker product pagelg.com/jp/monitors/gaming-monitors/39gx950b-bRead 5 October 2026Own original base-model built-in 7 W+7 W output. No physical driver count inferred.
Webcam
Not available
Not available
Microphone
Not available
Not available

Ergonomics and controls

7 of 15 differ
Stand height adjustment
110mm1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Height Adjustment 0 to 110 mm.
110mm2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 10 direct 110 mm maximum stand travel.
Tilt
Forward5°Backward20°1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Tilt +20 to -5 degrees, stored as 20 backward and 5 forward. The manual gives -5 to 20.
Forward8°Backward15°2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 11 direct -8/+15 degrees. Positive directional magnitudes stored.
Swivel
Left30°Right30°1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Swivel +30 to -30 degrees.
Left30°Right30°2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 11 direct 30 degrees left and right.
Pivot
Counterclockwise90°Clockwise90°1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Pivot +90 to -90 degrees.
Not available
Removable stand
Yes3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026Chapter 1.4 Detaching the arm/stand: push the locking clips and slide the stand out.
Yes2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 8 explicitly removes stand before wall mount by reversing assembly.
VESA mount
100 x 1001Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026VESA Wall Mounting 100x100 mm.
100 x 1002Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 7 exact 100 x 100 rear pattern.
VESA adapter needed
Yes3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026The package list names a Wall Mount Kit. Tom's Hardware describes a bracket that snaps onto the panel to make the 100 mm VESA mount and Guru3D lists a 100 x 100 mm VESA adapter in the box. The manual text at 1.4 says the VESA wall mount kit is purchased separately, which conflicts with its own package list. Stored as required, since the kit is needed and listed in the box.
No2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed pages 7-9 direct rear bracket attachment. Optional bracket is separate.
Security lock slot
Yes1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Kensington Lock Yes.
Yes2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 6 own socket and locking cable procedure. Cable optional.
On-screen menu controls
Joystick, Buttons, Software3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026Front view and controls: five-way control button, close button and power button. ASUS DisplayWidget Center adjusts monitor settings from the desktop. Tom's Hardware calls the control a joystick.
Joystick, Buttons, Software2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed pages 9-10 joystick and dedicated Dual Mode button. Printed page 16 personalized-picture software wizard and calibrated profiles alter display settings. Layout-only software is not counted.
Desktop software
ASUS DisplayWidget Center1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026DisplayWidget Yes, DisplayWidget Center.
LG Switch, LG Calibration Studio2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 11 named supported apps, with actual picture wizard and calibrated profiles on 16. Dual Controller data-sharing software is separate.
User firmware updates
Yes2Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwmRead 14 October 2026DisplayWidget Center offers firmware update notifications and a direct update option.
Not available
Ambient light sensor
Not available
Not available
Presence sensor
Yes1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Proximity Sensor, Neo Proximity Sensor. It detects the user's distance and blanks the screen when the user leaves. It is not an ambient light sensor.
Not available
RGB lighting
Yes1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Lighting effect (Aura) Aura Sync. The manual has Aura RGB with selectable colours.
Yes1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own RGB LED Lighting row Unity Hexagon Lighting 2.0. Manual static/cycling colour controls corroborate.
Gaming menu features
Frame Rate Boost, Variable Refresh Rate, ELMB, GamePlus, FPS Counter, Crosshair, Dynamic Crosshair, Sniper, Timer, Stopwatch, Display Alignment, GameVisual, Shadow Boost, Dynamic Shadow Boost, Aspect Control, AI Visual, Uniform Brightness, OLED Anti-Flicker2Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwmRead 14 October 2026Names from the feature page and manual: Frame Rate Boost, GamePlus tools, GameVisual, Shadow Boost, AI Assistant (AI Visual, Dynamic Crosshair, Dynamic Shadow Boost), Aspect Control, Uniform Brightness and OLED Anti-Flicker.
Black Stabilizer, Dynamic Action Sync, Crosshair, FPS Counter, AI Upscaling, AI Scene Optimization, AI Sound1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own named four features. Crosshair/FPS counter are mutually exclusive per own manual.2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed pages 16-17 name AI Upscaling High/Low/Off, AI Scene Optimization and AI Sound under AI Boost. AI Scene Optimization is available only in Personalized Picture, Gamer 1, Gamer 2, FPS, RTS, Vivid or Max Brightness presets. AI Sound applies to internal speakers and connected headphones. Own April 7 release separately requires at least WFHD source for AI Upscaling. Existing Crosshair and FPS Counter are mutually exclusive.11Press releaselg.com/us/newsroom/media-entertainment/game-on-lg-kicks-off-pre-orders-for-ultragear-evo-gx9-and-gm9-gaming-monitorsRead 5 October 2026Exact 39GX950B-B April 7 release names AI Upscaling, AI Scene Optimization and AI Sound. Footnote 8 requires WFHD or higher source for AI Upscaling. Picture-preset and audio-output conditions come from own manual page 16.

OLED care

3 of 3 differ
OLED care
Neo Proximity Sensor, Pixel Cleaning, Screen Move, Screen Saver, Auto Logo Brightness, Taskbar Detection, Outer Dimming Control, Global Dimming Control, Target Mode, Boundary Detection2Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwmRead 14 October 2026OLED Care Pro section names Neo Proximity Sensor, Pixel Cleaning, Screen Move, Screen Saver, Logo brightness adjustment, Taskbar detection, Outer dimming control, Global dimming control, Target mode and Boundary Detection.
Screen Saver, Image Cleaning2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 19 exact two OLED Care controls. Image Cleaning runs approximately 10 minutes after more than 10 minutes use since last cleaning when entering standby/off. No older Screen Move or separate Pixel Cleaning menu inherited.
Burn-in covered by warranty
Yes1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Warranty explicitly includes panel burn-in.
Not available
Burn-in warranty length
3years1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Warranty 3 years including panel burn-in.
Not available

Dimensions and weight

6 of 7 differ
Dimensions with stand
Width606Height (lowest)438Height (highest)548Depth256mm(23.9 × 17.2 to 21.6 × 10.1 in)1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Spec page gives 60.6 x 54.8 x 25.6 cm. The manual gives 606 x 548 x 256 mm (highest) and 606 x 438 x 256 mm (lowest), so the manual is used for the height range. Maker marks all dimensions and weights as estimates that vary by region.
Width921.4Height (lowest)495.4Height (highest)605.4Depth322.8mm(36.3 × 19.5 to 23.8 × 12.7 in)5Maker product pagelg.com/uk/monitors/ultragear-evo/39gx950b-bRead 5 October 2026Own exact UP/DOWN metric positions. Own U.S. manual page 21 corroborates upper position. No minimum height computed from travel.
Dimensions without stand
Width606Height369Depth63mm(23.9 × 14.5 × 2.5 in)1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Spec page 60.6 x 36.9 x 6.3 cm. The manual gives 606 x 369 x 63 mm.
Width921.4Height405Depth118.7mm(36.3 × 15.9 × 4.7 in)2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 21 own direct metric body dimensions. Curved envelope, not flattened active panel span.
Stand footprint
Not available
Not available
Weight with stand
8.1kg(17.9 lb)1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Net Weight with Stand 8.1 kg (estimate, varies by region).
10.7kg(23.6 lb)2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 21 net 10.7 kg with stand, without packaging.
Weight without stand
5.4kg(11.9 lb)1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Net Weight without Stand 5.4 kg (estimate, varies by region).
6.8kg(15 lb)2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 21 net 6.8 kg body, without stand or packaging.
Box dimensions
Width860Height490Depth163mm(33.9 × 19.3 × 6.4 in)1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Box Dimension (W x H x D) 86.0 x 49.00 x 16.3 cm. The manual gives 860 x 490 x 163 mm.
Width1,035Height296Depth549mm(40.7 × 11.7 × 21.6 in)5Maker product pagelg.com/uk/monitors/ultragear-evo/39gx950b-bRead 5 October 2026Own maker shipping W x H x D metric. Original Japanese base-model table agrees. Flat-packed orientation retained.
Box weight
11.8kg(26 lb)1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Gross Weight 11.8 kg (estimate, varies by region).
16.2kg(35.7 lb)5Maker product pagelg.com/uk/monitors/ultragear-evo/39gx950b-bRead 5 October 2026Own shipping 16.2 kg, above complete 10.7 kg product. Rounded U.S. 35.7 lb corroborates source rounding.

Power

8 of 13 differ
Power supply
Internal4EU energy label (EPREL)eprel.ec.europa.eu/fiches/electronicdisplays/Fiche_2688398_EN.pdfRead 14 October 2026Row 24 power supply type Internal.
External adapter1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own external adapter.
Adapter rating
Not available
270W2Owner's manualgscs-b2c.lge.com/downloadFileRead 5 October 2026Printed page 21 two adapter options explicitly 20 V x 13.5 A output, exactly 270 W. Device input 20 V x 12 A, 240 W is separate and not maximum operating consumption.
Input voltage
100-240 V AC, 50/60 Hz1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Voltage 100-240 V, 50/60 Hz.
100-240 V AC, 50/60 Hz1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own AC mains range. Not monitor 20 V DC or USB PD input.
Power use (typical)
Not available
54W4Maker spec sheet (PDF)lg.com/content/dam/channel/wcms/jp/catalog/pdf/202606_monitor_ultragear.pdfRead 5 October 2026Page 4 core 39GX950B column On Mode 54 W. Footnote 8 defines 200 cd/m² one hour measurement video. Original Japanese base-model page also 54 W. EU 40.3 W default 60 Hz test and device 240 W DC input are separate.
Power use (max)
Not available
Not available
Power use SDR (EU label)
25.3W4EU energy label (EPREL)eprel.ec.europa.eu/fiches/electronicdisplays/Fiche_2688398_EN.pdfRead 14 October 2026Row 4 on mode power demand in SDR 25.3 W.
40.3W9EU energy label (EPREL)lg.com/uk/lgecs.downloadFile.ldwfRead 5 October 2026Exact model English PIS page 2 row 4 EU on-mode SDR, default 60 Hz.
Power use HDR (EU label)
27W4EU energy label (EPREL)eprel.ec.europa.eu/fiches/electronicdisplays/Fiche_2688398_EN.pdfRead 14 October 2026Row 6 on mode power demand in HDR 27.0 W.
45.9W9EU energy label (EPREL)lg.com/uk/lgecs.downloadFile.ldwfRead 5 October 2026Exact PIS page 2 row 6 EU HDR on-mode.
Standby power
0.5W4EU energy label (EPREL)eprel.ec.europa.eu/fiches/electronicdisplays/Fiche_2688398_EN.pdfRead 14 October 2026Row 8 standby 0.5 W. The manual says less than 0.5 W.
0.5W9EU energy label (EPREL)lg.com/uk/lgecs.downloadFile.ldwfRead 5 October 2026Exact PIS page 2 row 8 standby demand. Not network standby.
Off-mode power
0.3W4EU energy label (EPREL)eprel.ec.europa.eu/fiches/electronicdisplays/Fiche_2688398_EN.pdfRead 14 October 2026Row 7 off mode 0.3 W. The manual says less than 0.3 W.
0.3W9EU energy label (EPREL)lg.com/uk/lgecs.downloadFile.ldwfRead 5 October 2026Exact PIS page 2 row 7 off demand. Maker less-than qualifier is separate.
EU energy class SDR
F4EU energy label (EPREL)eprel.ec.europa.eu/fiches/electronicdisplays/Fiche_2688398_EN.pdfRead 14 October 2026Row 3 class F.
G9EU energy label (EPREL)lg.com/uk/lgecs.downloadFile.ldwfRead 5 October 2026Exact PIS page 2 row 3.
EU energy class HDR
G4EU energy label (EPREL)eprel.ec.europa.eu/fiches/electronicdisplays/Fiche_2688398_EN.pdfRead 14 October 2026Row 5 class G.
G9EU energy label (EPREL)lg.com/uk/lgecs.downloadFile.ldwfRead 5 October 2026Exact PIS page 2 row 5.
Energy per 1000 h SDR
25kWh5EU energy label (EPREL)eprel.ec.europa.eu/labels/electronicdisplays/Label_2688398.pdfRead 14 October 2026Printed label 25 kWh/1000h.
40kWh10EU energy label (EPREL)lg.com/uk/lgecs.downloadFile.ldwfRead 5 October 2026Exact EU label integer 40 read directly, not calculated from decimal 40.3 W.
Energy per 1000 h HDR
27kWh5EU energy label (EPREL)eprel.ec.europa.eu/labels/electronicdisplays/Label_2688398.pdfRead 14 October 2026Printed label 27 kWh/1000h.
46kWh10EU energy label (EPREL)lg.com/uk/lgecs.downloadFile.ldwfRead 5 October 2026Exact EU label integer 46 read directly. Not inherited from SDR.

Certifications

5 of 9 differ
VESA ClearMR
Not available
Not available
VESA AdaptiveSync Display
480Hz1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Certificate list names both VESA AdaptiveSync Display 240Hz and VESA AdaptiveSync Display 480Hz. The higher number is stored.
Not available
TÜV certifications
Flicker-free1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Certificate list TUV Flicker-free.
Not available
Low blue light
Software3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026OSD Blue Light Filter (Level 1 to 4) is a selectable software filter. The maker lists no hardware low-blue-light certificate.
Hardware5Maker product pagelg.com/uk/monitors/ultragear-evo/39gx950b-bRead 5 October 2026Own feature explicitly UL Low Blue Light Hardware Solution Platinum V745051. Reader picture filter is separate.
ENERGY STAR
Not available
Not available
TCO Certified
Not available
Not available
EPEAT
Not available
Not available
Colour certifications
Not available
UL Perfect Color V569367, Intertek 100% Color Fidelity 24KRQ0950-02, UL Perfect Reproduction V7567603Maker product pagelg.com/jp/monitors/gaming-monitors/39gx950b-bRead 5 October 2026Own original base-model certificate names. Perfect Color uses 0/500 lux colour fidelity. Perfect Reproduction uses 95% pixel accuracy at 0-500 lux. These are panel claims, not proof of a paper factory report.
Other certifications
FSC MIX1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Certificate list FSC MIX.
UL Flicker-Free Display A196009, UL Discomfort Glare Free V563481, UL Low Blue Light Hardware Solution Platinum V745051, Eyesafe 3.0 CPF60 V745354, Eyesafe 3.0 RPF40 V275741, UL Perfect Black OLED V1836325Maker product pagelg.com/uk/monitors/ultragear-evo/39gx950b-bRead 5 October 2026Own certificate footnote. Discomfort Glare condition UGR<22, Eyesafe CPF60/RPF40 explicitly named.11Press releaselg.com/us/newsroom/media-entertainment/game-on-lg-kicks-off-pre-orders-for-ultragear-evo-gx9-and-gm9-gaming-monitorsRead 5 October 2026Own 39GX950B-B OLED certificate footnote 5 expressly names UL Perfect Black OLED V183632. This is a black-performance certification, not a measured contrast ratio.

In the box

2 of 2 differ
In the box
OLED Monitor, Quick Start Guide, Warranty Card, Power Cord, ROG Pouch, ROG Sticker, Monitor Base, Wall Mount Kit, Microfiber Cloth, USB Type-C cable (optional), HDMI cable (optional), DP cable (optional), USB cable (optional), Feature label (optional)1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Accessories list on the spec page differs by region and names a DisplayPort 2.1 (DP80) cable, HDMI Ultra High Speed Cable, USB 3.2 cable, USB-C cable and a VESA mount kit. The manual package list is stored verbatim.
Monitor, Stand, AC/DC adapter, Power cable, HDMI cable, DisplayPort cable, USB-C cable1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own U.S. HDMI, DP and USB-C cable rows, matching core stand/adapter manual assembly. No optional remote, regional paper report or unstated cable counts inferred.
Cables included
AASUS ROG Swift OLED PG27UCWM
TypeCount
Power Cord1
DisplayPort 2.1 (DP80) cableNot available
HDMI Ultra High Speed CableNot available
USB 3.2 cableNot available
USB-C cableNot available
Source3Owner's manualdlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG27UCWM/ASUS_PG27UCWM_UM_EN.pdfRead 14 October 2026Package list marks the power cord as standard and the USB-C, HDMI, DP and USB cables as optional. The maker spec page accessories list (varies by region) names the DisplayPort 2.1 (DP80), HDMI Ultra High Speed, USB 3.2 and USB-C cables, and Guru3D and Tom's Hardware found these cables in their boxes. Counts are only stored for the power cord.
BLG UltraGear evo GX9 39GX950B
Not available

Warranty

1 of 2 differ
Manufacturer warranty (source market)
3years1Maker product pagerog.asus.com/monitors/27-to-31-5-inches/rog-swift-oled-pg27ucwm/specRead 14 October 2026Warranty 3 years (including panel burn-in). Country terms can differ.
2years1Maker product pagelg.com/us/monitors/lg-39gx950b-b-gaming-monitorRead 5 October 2026Exact U.S. 39GX950B-B AllInfo. Own U.S. 2-Year Parts and Labor. Optional two-year LG Premium Care extension in preorder offer is separate. Burn-in-specific coverage is not explicitly proved.
Dead pixel policy
Not available
Not available

Both are also in the API. Back to all monitors.