Power supplies / Compare

ASRock PRO-850G vs CORSAIR RM850x SHIFT (2025)

A

Product A: ASRock

PRO-850G

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B

Product B: CORSAIR

RM850x SHIFT (2025)

52 of 66 known

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Only differences

AASRock PRO-850G

BCORSAIR RM850x SHIFT (2025)

General

5 of 12 differ

Series

PRO2Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Listed under ASRock Power Supply, PRO series.

RMx SHIFT1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Product title: RM850x SHIFT. The maker calls the line RMx SHIFT. The page is the second generation (SKU CP-9020299-NA, model RPS0221), not the 2022 RM850x SHIFT (CP-9020252 and CP-9020274, model RPS0160).

Model numbersiMaker identifiers for this exact model and its listed variants. Excludes sibling models and other generations.

PRO-850G, 90-UXR085-GNUAA2, 90-UXR085-GNEAA26Retailer pageamazon.com/dp/B0FSTHTLZTRead 14 October 2026Amazon US lists model number 90-UXR085-GNUAA2 and manufacturer part PRO-850G. Paradigit and Grosbill list 90-UXR085-GNEAA2 for the EU unit.7Retailer pageparadigit.ie/asrock-pro-850g-850-w/21845961/productRead 14 October 2026Product number manufacturer 90-UXR085-GNEAA2.

CP-9020299-NA, CP-9020299-EU, CP-9020299-UK1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026SKU CP-9020299-NA. The power table prints model RPS0221 and part no. 75-006527, which are not stored as model numbers.7Retailer pageamazon.com/dp/B0FPGD7XDKRead 15 October 2026Item details: Model Number CP-9020299-NA.8Retailer pagewebshop.netip.dk/corsair-rm850x-shift-80-gold/cat-p/c/p1006311000Read 15 October 2026SKU CP-9020299-EU.9Retailer pagescan.co.uk/products/850w-corsair-rm850x-shift-fully-modular-cybenetics-gold-pcie-51-single-rail-708a-140mm-fan-aRead 15 October 2026Scan lists CP-9020299-UK.

GTIN / EAN

47115814914418Retailer pageshop.post.ch/en/electronics/pc-components/power-supply-units/asrock-power-supply-pro-series-pro-850g-850-w/p/878897Read 14 October 2026EAN 4711581491441 for PRO-850G. Grosbill lists the same EAN with reference 90-UXR085-GNEAA2.9Retailer pagegrosbill.com/asrock-atx-850w-169624Read 14 October 2026EAN 4711581491441, manufacturer reference 90-UXR085-GNEAA2. Grosbill ticks ATX 3.0 and calls the cables non-modular. The maker says ATX 3.1, which is stored.

840440484981, 840440484974, 8400066794487Retailer pageamazon.com/dp/B0FPGD7XDKRead 15 October 2026Item details: UPC 840440484981 and Mfr Part Number CP-9020299-NA. The check digit is valid.8Retailer pagewebshop.netip.dk/corsair-rm850x-shift-80-gold/cat-p/c/p1006311000Read 15 October 2026SKU CP-9020299-EU with EAN 0840440484974. Multitronic and DCS list the same code. Komputronik and Datafox also list 840006677284 for the same part number, which has a valid check digit too. The code that matches the US UPC prefix is stored.9Retailer pagescan.co.uk/products/850w-corsair-rm850x-shift-fully-modular-cybenetics-gold-pcie-51-single-rail-708a-140mm-fan-aRead 15 October 2026Scan lists manufacturer code CP-9020299-UK with GTIN 840006679448. The check digit is valid. This is the only source for the UK code.

AnnouncediThe maker's first announcement of this model. This is separate from first retail availability.

Not available

4 November 20253Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026Press release dated November 4, 2025.

Status

Available2Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Archive copy of the ASRock page from 2025-09-19 (the model is listed). Retailers sell the unit in October 2026.

Available1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Page shows In Stock, with a price of $139.99 against an original price of $169.99.

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

Not available

Not available

SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

Not available

Not available

Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

Not available

Not available

Launch price (EU)iThe maker's euro launch price for the stated configuration, including VAT as published. Current store prices and later discounts do not qualify.

Not available

€169.94Maker product pageweb.archive.org/web/20251105034749/https://www.corsair.com/de/de/p/psu/cp-9020299-eu/rm850x-shift-fully-modular-atx-power-supply-eu-cp-9020299-euRead 15 October 2026Archived copy of the Corsair German page for CP-9020299-EU from 2025-11-05, the day after launch. It shows a price of 169,90 EUR with no discount, including VAT. The Spanish outlet Geektopia gives the same launch price of 169.90 EUR. No US dollar launch price is stored, because the archived Corsair US page shows $184.99 from November 2025 to January 2026 and $169.99 from February 2026, while Hardware Busters gives an MSRP of $170 excluding VAT.

MarketsiISO country or region codes where this exact model or variant is sold. A source page's language does not establish availability.

Not available

Not available

ColoursiThe maker's own colour names

Black7Retailer pageparadigit.ie/asrock-pro-850g-850-w/21845961/productRead 14 October 2026Colour of product: Black.

Black7Retailer pageamazon.com/dp/B0FPGD7XDKRead 15 October 2026Title: CORSAIR RM850x Shift (2025) Fully Modular ATX Power Supply, Black.

Form factoriThe physical size standard that decides what fits in the case. An ATX unit is 150 × 86 mm at the back. An SFX unit is 125 × 63.5 mm.

ATX6Retailer pageamazon.com/dp/B0FSTHTLZTRead 14 October 2026Product details: Form Factor ATX. The 150 x 86 mm back face is the ATX size.

ATX1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Tech Specs: Dimensions 160mm x 150mm x 86mm. The back face is 150 x 86 mm, the standard ATX size.

ATX versioniThe ATX12V design guide revision the maker claims compliance with. A 16-pin GPU cable alone does not establish ATX 3.x. A Cybenetics report that withholds its ATX badge does not change the maker's claim. It goes in the source note.

ATX 3.12Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Specification: ATX 12V Version ATX 3.1. Headline: ATX3.1 & PCIe5.1 Ready.

ATX 3.11Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Overview: ATX 3.1-certified and PCIe 5.1 compliant. Tech Specs: ATX12V Version 3.1.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026Meeting ATX 3.1 and PCIe 5.1 standards.

PCIe CEM versioniThe PCI Express card power revision the maker claims, as printed next to the ATX version. It sets the GPU power connector rules. It is not a slot speed. A reviewer's statement is not enough.

PCIe 5.12Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Headline: ATX3.1 & PCIe5.1 Ready. Connector row: PCIe5.1 connectors (12+4pin) Dual Color.

PCIe 5.11Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Overview: ATX 3.1-certified and PCIe 5.1 compliant.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026Meeting ATX 3.1 and PCIe 5.1 standards.

Modular cablesiFull means every cable detaches. Semi means some cables are fixed, usually the 24-pin and CPU cables.

None6Retailer pageamazon.com/dp/B0FSTHTLZTRead 14 October 2026Product details: Power Supply Design Non-Modular. Customer reviews also say all cables are permanently attached.7Retailer pageparadigit.ie/asrock-pro-850g-850-w/21845961/productRead 14 October 2026Headline and specification: Non Modular. Inside Tech's listing says Modular: Fully, but its own table lists the same fixed counts as ASRock (one 24-pin, one EPS, two PCIe 6+2, four SATA) and the fully modular unit is the separate PRO-M850G. Amazon, Post.ch, Grosbill and Geektopia say non-modular, so none is stored as modular.8Retailer pageshop.post.ch/en/electronics/pc-components/power-supply-units/asrock-power-supply-pro-series-pro-850g-850-w/p/878897Read 14 October 2026Cable harness: Fixed.10Spec databasegeektopia.es/es/product/asrock/pro-850gRead 14 October 2026Modular: no. Geektopia gives a presentation date of April 17, 2026, which is later than the ASRock page archived in September 2025, so it is not used for the release month.

Fully modular1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Overview: Fully modular with Type-5 connectors.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026Fully modular, so builders can use only the cables they need.

Built by (OEM)iThe company that designed and built the unit for the brand, such as CWT or FSP. As named by the maker, a teardown review or a Cybenetics report.

Not available

Great Wall5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026DUT Information: OEM/ODM Great Wall. Parts description: Manufacturer (OEM) Great Wall.6Reviewhwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Manufacturer (OEM) Great Wall.

Power

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Rated continuous poweriThe continuous DC output the maker rates the unit for, such as 850. Peak or power excursion figures are not stored here.

850W2Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Model name PRO-850G and the 80 PLUS certificate state 850 W.5Certification listclearesult.com/80plus/sites/80plus/files/manufacturer-certificate/ASRock_PRO-850G_850W_SOCE%207106.7_Report.pdfRead 14 October 2026Rated output power 850 W.

850W1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Tech Specs: Continuous Power W 850 Watts and Total Power 850W.

Full power rated up toiThe ambient temperature up to which the maker rates full continuous power, such as 50 °C. A review table that prints 0-50 °C with no maker source is not enough. An operating temperature range that does not say full power is not enough. A maker table with load steps gives the full-load row, such as 40 °C at full load next to 50 °C at 80 percent load. A temperature that a Cybenetics report marks as manufacturer-provided counts as a maker statement.

Not available

Not available

12V rail designiHow the maker splits +12V over-current protection. Switchable means the user picks single or multi rail with a switch or in software.

Not available

Single rail5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Power Specifications: one +12V column with 70.8 A and 850 W.6Reviewhwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Number of 12V rails 1.

+12V max currentiHighest combined current on +12V from the maker's power table. For a multi-rail unit this is the combined total, not one rail.

70.8A2Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Specification: Continuous 12V output 70.8 A. ASRock publishes no +3.3V, +5V or +5VSB table for this model.7Retailer pageparadigit.ie/asrock-pro-850g-850-w/21845961/productRead 14 October 2026Energy management: Max output current (+12V) 70.8 A. The same table lists +3.3V and +5V at 100 W each, which is not the combined limit and is not stored.

70.8A1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Power table: +12V 70.8A, 850W.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026RM850x power table, model RPS0221, part no. 75-006527: +12V 70.8A, 850W.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Power Specifications table: +12V 70.8 A, 850 W.

+12V max poweriHighest combined power on +12V from the maker's power table.

850W7Retailer pageparadigit.ie/asrock-pro-850g-850-w/21845961/productRead 14 October 2026Energy management: Combined power (+12V) 850 W.

850W1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Power table: +12V 70.8A with 850W listed beside the row. The Cybenetics report also prints 850 W for +12V.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026RM850x power table: +12V 70.8A, 850W.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Power Specifications table: +12V 850 W.

+3.3V and +5V combined poweriThe combined limit for the +3.3V and +5V rails from the maker's power table. A table that prints the same figure under both rails, as be quiet! does, shows one shared limit, so the figure is stored once and not added.

Not available

120W1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Power table: +3.3V 20A and +5V 20A with one 120W cell. The page layout does not tie the 120W to one rail. The Cybenetics report and Hardware Busters print it as the combined +3.3V and +5V power.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026RM850x power table: +3.3V 20A, +5V 20A and one 120W cell.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Power Specifications table: one merged 120 W cell for 3.3V and 5V, 20 A each.6Reviewhwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Power 5V + 3.3V 120W.

+5V standby currentiHighest current on the +5VSB standby rail. It powers USB charging and wake functions while the PC is off.

3A7Retailer pageparadigit.ie/asrock-pro-850g-850-w/21845961/productRead 14 October 2026Energy management: Max output current (+5Vsb) 3 A.

3A1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Power table: +5VSB 3A, 15W.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026RM850x power table: +5Vsb 3A, 15W.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Power Specifications table: 5VSB 3 A, 15 W.

AC input voltageiThe rated AC input range, such as 100 to 240 V.

Lowest100Highest240V2Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Specification: AC Input 100-240V~, 50-60Hz, 12-6A.

Lowest100Highest240V1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Power table: AC input 100V-240V, input current 10A-5A, 47Hz-63Hz.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026RM850x power table: AC input 100V-240V, input current 10A-5A, 47Hz-63Hz.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Manufacturer-provided information: 100-240 Vrms, 5-10 A, 47-63 Hz.

Alternative low power mode (ALPM)iThe maker or a Cybenetics report states support for the ATX alternative low power mode used by Modern Standby.

Not available

Yes1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Tech Specs: Modern Standby Yes. The Cybenetics report ticks ALPM compatible.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Temperature and Compliance Info: ALPM (Alternative Low Power Mode) compatible, checked. ATX v3.1 PSU Power Excursion is checked.6Reviewhwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Alternative Low Power Mode support Yes.

Certifications

5 of 5 differ

80 PLUS ratingiThe 80 PLUS level. When the 80 PLUS listing or certificate and the maker claim differ, store the listing level and put the claim and test voltage in the source note. When a model has several 80 PLUS entries, such as a newer test at a higher level, use the newest entry that matches the current maker documents.

80 PLUS Gold2Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Headline: 80 PLUS GOLD Certified.5Certification listclearesult.com/80plus/sites/80plus/files/manufacturer-certificate/ASRock_PRO-850G_850W_SOCE%207106.7_Report.pdfRead 14 October 202680 PLUS certificate ID 7106.7 for model PRO-850G: Gold at 115 V, rated 850 W, type ATX12V, test date 2023-07-27, average efficiency 87.69% and 91.47% at 50% load. The test date is older than the ATX 3.1 standard, so ASRock may have kept the certificate for the ATX 3.1 revision. The ASRock page and all retailers state Gold.

Not available

Cybenetics efficiency at 115ViThe Cybenetics ETA level from the 115V test. The Cybenetics report wins over the maker's claim.

Not available

Cybenetics Platinum5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Report 25PS2879, lab ID CR85002879, sample serial A9H1D518401FMC, received Jun 13, 2025, tested Jul 7, 2025, issued Jul 10, 2025. The model name is RM850x Shift (ATX v3.1). The Cybenetics database shows ETA Platinum at 115V. Corsair advertises Cybenetics Gold without a voltage, and Hardware Busters says Corsair used a lower badge on purpose. The report wins.

Cybenetics efficiency at 230ViThe Cybenetics ETA level from the 230V test. The 230V thresholds are higher, so the level can differ from the 115V level. The Cybenetics report wins over the maker's claim.

Not available

Cybenetics Platinum5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026The Cybenetics database shows ETA Platinum at 230V.

Cybenetics noise at 115ViThe Cybenetics LAMBDA level from the 115V test. A++ is the quietest. The Cybenetics report wins over the maker's claim.

Not available

A++5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026LAMBDA A++ at 115V in the Cybenetics database. Corsair's page prints Cybenetics Noise A+, which the report does not support.

Cybenetics noise at 230ViThe Cybenetics LAMBDA level from the 230V test. The Cybenetics report wins over the maker's claim.

Not available

A++5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026LAMBDA A++ at 230V in the Cybenetics database.

Measured

10 of 10 differ

Average efficiency at 115V (measured)iAverage efficiency over the whole load range at 115V input, from more than 1450 load combinations in the Cybenetics method. It is not the peak efficiency or the efficiency at 50% load.

Not available

90.009%5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Average over more than 1450 load combinations at 115V, ambient 28-32 C. Hardware Busters prints 90.080% for 115V and 92.076% for 230V, which differ slightly from the report page.

Average efficiency at 230V (measured)iThe same average efficiency at 230V input.

Not available

91.794%5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Average over more than 1450 load combinations at 230V.

Light-load efficiency at 115V (measured)iEfficiency at a 10 W load for units up to 500 W, or at a 2% load for larger units, at 115V input. This is the ATX light-load test.

Not available

72.66%5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Efficiency at 2% load (more than 500 W unit) at 115V.

Average power factor at 115V (measured)iAverage power factor over the whole load range at 115V input. 1 is the best possible value.

Not available

0.9925Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Average over more than 1450 load combinations at 115V. At 230V it is 0.966.

Average noise at 115V (measured)iAverage noise over the whole load range at 115V input in the Cybenetics method, at about 30 °C ambient. It is not the noise at full load.

Not available

10.65dB(A)5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Average over more than 1450 load combinations at 115V, ambient 28-32 C, Bruel and Kjaer 2270 G4 sound analyzer. The 230V average is 10.97 dBA. The fan stays at 0 rpm up to 50% load.

Noise at full load at 115V (measured)iNoise at 100% load at 115V input in the Cybenetics typical load tests. That row often runs at about 45 °C intake. The intake temperature and the fan speed go in the source note. Lower is better.

Not available

32.8dB(A)5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Typical load tests at 115V, 100% load row: 32.8 dB(A) at 1064 rpm fan speed, ambient about 30 C. At 230V it is 32.2 dB(A) at 1037 rpm.

Standby power with no load at 115V (measured)iPower the unit draws from the wall with the PC off and nothing drawn from +5VSB, at 115V input.

Not available

0.0405W5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Standby power consumption at 115V with no load on +5VSB: 0.0405 W. At 230V it is 0.0818 W.

Hold-up time (measured)iHow long the outputs stay in regulation after AC power is lost, at maximum continuous load, as printed in the Cybenetics report. The report names no input voltage. The AC loss to PWR_OK time goes in the source note. Higher is better.

Not available

24.5ms5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Hold-Up Time and PWR_OK Signal: hold-up time 24.50 ms, AC loss to PWR_OK 19.70 ms, PWR_OK inactive to DC loss 4.80 ms, at maximum continuous load. The report names no input voltage.

12V ripple at full load (measured)iPeak-to-peak ripple on the +12V rail at full load and 115V input. Lower is better.

Not available

20.97mV5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Non-accredited. 12V ripple at full load at 115V. At 230V it is 22.45 mV.

12V load regulation (measured)iHow far the +12V voltage moves between light and full load at 115V input. Lower is better.

Not available

0.57%5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Non-accredited. 12V load regulation at 115V. At 230V it is 0.57%.

Cables and connectors

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CablesiOne row per kind of cable that runs from the PSU to a device. Connector is the plug at the device end. Count is the number of those plugs over all cables in the row. Length runs from the PSU end to the first plug. Adapters that plug into other cables are left out. Use 16-pin PCIe when the maker names a 16-pin GPU cable without saying 12V-2x6 or 12VHPWR. A cable from a 12V-2x6 socket on the PSU to 8-pin plugs is a cable, not an adapter, and counts as PCIe 8-pin. When the maker's documents name one GPU cable both 12VHPWR and 12V-2x6, use 16-pin PCIe and name both in the source note. Cables of one connector kind with different lengths or wire gauges get one row each.

AASRock PRO-850G

Connector	Connectors	Cables	Length to first plug (mm)
ATX 24-pin (20+4)	1	1	600
CPU 8-pin (EPS, 4+4)	1	1	650
PCIe 8-pin (6+2)	2	2	600
12V-2x6	1	1	600
SATA power	4	2	450
4-pin Molex	2	1	450

Source2Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Specification connector rows: 24-pin 1, EPS 4+4 pin 1, PCIe 5.1 12+4 pin dual color 1, PCIe 6+2 pin 2, 4-pin peripheral 2, SATA 4. The lengths and cable counts come from the cable drawing on the Amazon listing. The page gives no cable lengths or wire gauge. 12V-2x6 power rating is not stated for this model.6Retailer pageamazon.com/dp/B0FSTHTLZTRead 14 October 2026Listing image 4, a drawing published with the product: MB 24 pin 1x 600 mm, CPU 4+4 pin 1x 650 mm, PCIe 12V-2x6 1x 600 mm, PCIe 6+2 pin 2x 600 mm, one SATA cable with 3 SATA plugs and one PATA cable with 2 PATA plugs and 1 SATA plug, both 450 mm to the first plug and 120 mm between plugs. Totals match the ASRock page: 4 SATA and 2 peripheral plugs. The two PCIe 6+2 pin plugs are drawn as two separate cables. The same listing gallery also shows the PRO-850B, PRO-650B and PRO-750G, so only this drawing, which matches the ASRock counts, is used.

BCORSAIR RM850x SHIFT (2025)

Connector	Connectors	Cables	Length to first plug (mm)	Wire gauge	Rated power (W)
ATX 24-pin (20+4)	1	1	610	16-20AWG	Not available
CPU 8-pin (EPS, 4+4)	2	2	650	18AWG	Not available
PCIe 8-pin (6+2)	4	3	650	18AWG	Not available
12V-2x6	1	1	650	Not available	600
SATA power	9	3	500	18AWG	Not available
4-pin Molex	4	1	450	18AWG	Not available

Source1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Cable listing: 1 ATX 24-pin 610 mm, 2 EPS 4+4-pin 650 mm, 2 PCIe 8-pin (6+2-pin) 650 mm, 1 90-degree 12V-2x6 to 600W 12V-2x6 (12+4-pin) 650 mm, 1 600W 90-degree 12V-2x6 to 2x 8-pin PCIe (6+2-pin) cable with 2 plugs 650 mm, 3 SATA cables with 3 plugs each (500 mm to the first plug, 100 mm spacing, 700 mm total) and 1 PATA cable with 4 plugs (450 mm to the first plug, 100 mm spacing, 750 mm total). All lengths have a tolerance of 10 mm. PATA plugs are the 4-pin Molex plugs. The 12V-2x6 to 2x 8-pin cable is stored as a PCIe 8-pin cable with 2 plugs. It and the 12V-2x6 cable both plug into the native 12V-2x6 socket of the PSU, as Hardware Busters says the modular panel has one native 12V-2x6 header. The Cybenetics report and Hardware Busters list the 2x 8-pin cable as 2 cables with 2 connectors, which does not match Corsair's listing. Gauges come from the Cybenetics report.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026Included cables for the RM850x, with the SATA count stated for the 850W: 1x ATX 24-pin 610 mm, 2x EPS 4+4-pin 650 mm, 2x PCIe 8-pin 650 mm, 1x 90-degree 12V-2x6 to 2x 8-pin PCIe 650 mm, 1x 90-degree 12V-2x6 to 600W 12V-2x6 650 mm, 3x SATA, 1x PATA.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Cables and Connectors table: ATX 24 pin 610 mm 16-20AWG, 2 x 4+4 pin ATX12V 650 mm 18AWG, 2 x 6+2 pin PCIe 650 mm 18AWG, 2 x 2x 6+2 pin PCIe 650 mm 18AWG, 12+2 pin PCIe 650 mm (600W) 16-24AWG, 3 SATA cables with 9 plugs in total 18AWG and 1 Molex cable with 4 plugs 18AWG, no in-cable capacitors. The 16-24AWG range of the 12V-2x6 cable includes the sideband wires, so no gauge is stored for it. The 18AWG gauge of the PCIe cables is stored for the 2x 8-pin cable too.6Reviewhwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-reviewRead 15 October 2026Cables page: the modular panel has eleven sockets including one native 12V-2x6 header, and all cables are debossed PVC. Review date November 16, 2025.

CPU (EPS) connectorsi8-pin or 4+4-pin CPU power plugs.

1=CalculatedFrom Cables

2=CalculatedFrom Cables

PCIe 8-pin connectorsi8-pin or 6+2-pin GPU power plugs. Counts the plugs in the box. Some cables share one PSU socket, which the source note says.

2=CalculatedFrom Cables

4=CalculatedFrom Cables

16-pin GPU connectorsiNative 16-pin GPU power plugs: 12V-2x6, 12VHPWR and 16-pin cables of unstated revision. Adapters are not counted. Counts the plugs in the box. Some cables share one PSU socket, which the source note says.

1=CalculatedFrom Cables

1=CalculatedFrom Cables

SATA power connectors

4=CalculatedFrom Cables

9=CalculatedFrom Cables

4-pin Molex connectors

2=CalculatedFrom Cables

4=CalculatedFrom Cables

Cable styleiHow the modular cables are made. Mixed means some cables are sleeved and others flat, such as a sleeved 24-pin cable with flat other cables. From the maker page or a review photo page.

Flat2Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Specification: Cable Type Flat.

Embossed or debossed flat1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Cable listing: Debossed cable type for every cable. Tech Specs: Cable Type Type 5. Stored as embossed, which covers debossed jackets.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026Improved debossed-PVC cables with low-profile combs.

Fan

3 of 4 differ

Fan sizeiFrame size of the cooling fan, such as 120, 135 or 140.

120mm2Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Specification: Fan 120mm Fan. Headline: Low noise 120mm FAN. The page names no bearing.

140mm1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Tech Specs: Fan Size MM 140mm.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026A quiet 140mm fluid dynamic bearing fan.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026DUT Information: 140mm Fluid Dynamic Bearing Fan (NR140HP).

Fan bearingiUse the maker's bearing name. FDB and S-FDB are fluid dynamic. HDB is hydrodynamic. Noctua SSO and SSO2 are SSO. Corsair Magnetic Dome is magnetic dome. A brand bearing name that fits no option is Other.

Not available

Fluid dynamic (FDB)1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Tech Specs: Fan Bearing Technology FDB. Overview: 140mm Fluid Dynamic Bearing fan.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026A quiet 140mm fluid dynamic bearing fan.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Parts description: Corsair NR140HP, 140mm, 12V, 0.33A, Fluid Dynamic Bearing Fan.

Fan modeiSemi-passive means the fan stops at low load, often sold as zero RPM, hybrid or 0 dB mode. Fanless means the unit has no fan.

Always on2Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Specification: iCOOL MODE No. The quick installation guide says that with iCOOL mode on, the fan does not spin at low to medium load. With iCOOL marked No, the fan spins at all loads.3Owner's manualdownload.asrock.com/Manual/QIG/Power%20Supply%20Series_multiQIG.pdfRead 14 October 2026Step 8: if the iCOOL mode is set to ON, the fan will not spin during low to medium loads.

Semi-passive1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Overview: Zero RPM Mode for near-silent operation at lower loads.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026Zero RPM mode: the fan switches off entirely at low and medium loads. A rear-mounted knob adjusts fan speed.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026DUT Information: Semi-Passive Operation checked (selectable). The typical load table shows the fan at 0 rpm from 10% to 50% load.6Reviewhwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Semi-Passive Operation yes (selectable). Corsair's guide says the fan speed knob sets the speed once the fan starts and does not turn Zero RPM mode off, so no fan mode switch is stored.

Fan mode switchiA button, switch or software setting lets the user turn the semi-passive mode off so the fan always spins. A unit without a semi-passive mode, whose fan the maker says always spins, has no switch, so it is false.

Not available

Not available

Protection and parts

2 of 3 differ

ProtectionsiProtections the maker lists, or a retailer spec table copies from the maker, plus protections the Cybenetics protection tests show working (UVP, NLO, SIP). The Cybenetics manufacturer list has no OVP or UVP row, so do not build the list from it alone. A protection that is not listed may still exist. No-load covers no-load operation and no-load protection. Fan failure is a maker's fan failure protection or fan safeguard, also when the Cybenetics manufacturer block lists it.

Over-current (OCP), Short-circuit (SCP), Over-voltage (OVP), Under-voltage (UVP), Over-temperature (OTP), Over-power (OPP)2Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Specification: Protections OCP, SCP, OVP, UVP, OTP, OPP.

Over-current (OCP), Over-voltage (OVP), Under-voltage (UVP), Over-power (OPP), Over-temperature (OTP), Short-circuit (SCP), No-load (NLO), Surge and inrush (SIP)2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026Protection section for the series: OVP on 12V, 5V and 3.3V, OCP on 3.3V, 5V and 12V, OTP, SCP and OPP. UVP, NLO and SIP come from the Hardware Busters protection tests.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Protection Features (Manufacturer): OPP, +12V OCP, OTP, SCP, surge protection and inrush protection ticked, fan failure protection not present.6Reviewhwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-reviewRead 15 October 2026Protection Features page: OCP on 12V, 5V, 3.3V and 5VSB, OPP, OTP, SCP, UVP (90V full load and 80V no damage), NLO and SIP (surge MOV, inrush NTC and bypass relay) all shown. Fan failure protection is not present.

All-Japanese capacitorsiThe maker states that every electrolytic capacitor is from a Japanese maker. A Japanese bulk capacitor alone is not enough. A spec row such as "Japanese capacitors" that names no exception counts.

No2Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Specification: Capacitors All Taiwanese. Stored as false.

Yes1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Overview: 105 C-rated, 100% Japanese electrolytic capacitors. The Cybenetics parts list also shows polymer capacitors from FPCAP, which the claim does not cover.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026105 C-rated 100% Japanese capacitors.

MTBF (claimed)iThe maker's mean time between failures, such as 100000. An MTTF figure for the whole unit counts too. An MTTF for the fan alone does not. The test temperature goes in the source note.

100,000h2Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Specification: MTBF (Hours)@25°C 100,000.

100,000h1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Tech Specs: MTBF Hours 100,000 hours. The test temperature is not stated.

Monitoring and lighting

None of 4 known

Software monitoringiThe unit reports power, temperature or fan data to PC software over a USB or internal connection.

Not available

Not available

SoftwareiThe maker's software for monitoring or control.

Not available

Not available

Built-in power displayiA screen on the unit that shows live power draw or other readings.

Not available

Not available

RGB lighting

Not available

Not available

Dimensions and weight

2 of 2 differ

DimensionsiBody without cables. Width and height are the back face with the AC inlet. Depth is the length into the case, which decides case fit.

Width150Height86Depth140mm(5.9 × 3.4 × 5.5 in)2Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Specification: Dimensions (L x W x H) 140mm x 150mm x 86mm. Depth is 140 mm and the back face is 150 x 86 mm.6Retailer pageamazon.com/dp/B0FSTHTLZTRead 14 October 2026Item dimensions 5.51 x 5.91 x 3.39 inches, which is 140 x 150 x 86 mm.

Width150Height86Depth160mm(5.9 × 3.4 × 6.3 in)1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Tech Specs: Dimensions 160mm x 150mm x 86mm with no axis names. The quick start guide gives length 160 mm, width 150 mm and height 86 mm. Depth is 160 mm.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026RM850x specifications: 160mm length, 150mm width, 86mm height.

WeightiWeight of the unit alone. Use the Hardware Busters figure on hwbusters.com when the maker states none, not a copy on another site. Maker weights that include cables or the box, such as Corsair's, and retailer packed weights are not stored. A net weight counts unless the maker says it includes the cables.

Not available

1.6kg(3.5 lb)6Reviewhwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: 1.60 kg (3.53 lb). Corsair's page prints 2kg and its US shop page showed 2.89kg in November 2025, which are packed weights and are not stored.

In the box

None of 1 known

In the boxiItems supplied with this exact model, verbatim. The AC power cord differs per region.

Not available

Not available

Links

Not compared

Product page

www.asrock.com/Power-Supply/PRO/PRO-850G/index.asp1Maker product pageasrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Maker page for the PRO-850G. ASRock's bot protection returns an empty page to the agent, so no value is taken from the live page. The text was read from the archive copy below.

www.corsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-na1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026

Spec sheet

Not available

Not available

Manual

download.asrock.com/Manual/QIG/Power%20Supply%20Series_multiQIG.pdf3Owner's manualdownload.asrock.com/Manual/QIG/Power%20Supply%20Series_multiQIG.pdfRead 14 October 2026Quick Installation Guide, linked from the ASRock PRO-850G page as the manual. It is shared by all ASRock power supply series and names no model values.

www.corsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generation2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026Quick start guide of the RMx SHIFT Series 2nd generation. It covers the 750W, 850W and 1000W models. The page also keeps no separate PDF.

EPREL registration numberiId in the EU energy label database. Each size or model of a series has its own id, so it is per variant.

Not available

Not available

Warranty

1 of 1 differ

Manufacturer warranty (source market)iThe maker's warranty period for the exact SKU or configuration and market named in the source note. It applies only to that stated market, not every regional variant. Statutory consumer rights are excluded. The base term is stored. An extension that needs registration goes in the source note.

3years2Maker product pageweb.archive.org/web/20250919085843/https://asrock.com/Power-Supply/PRO/PRO-850G/index.aspRead 14 October 2026Specification: Warranty (Years) 3. The page is the global ASRock page and names no market.

10years1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Tech Specs: Warranty 10 Year and the Overview says 10-year warranty. The page is the US shop.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026CORSAIR RMx SHIFT Series 2nd Gen PSUs have a 10-year warranty.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026Each unit includes a ten-year warranty.

Both are also in the API. Back to all power supplies.