PC parts / Power supplies
SeasonicPower supply
CORE GX-850 (2024)
Released December 2024.2Press releasefunkykit.com/news/seasonic-launches-updated-core-atx-3-psu-series-with-atx-3-1-and-pcie-gen-5-1Read 15 October 2026Seasonic's launch release, posted by Funky Kit on December 6, 2024. Estimated time to market was late December 2024 for the black version in Europe, January 2025 in the USA and Q4 2024 for the rest of the world. LDLC listed the unit on December 5, 2024 and KitGuru reviewed the 850W on December 31, 2024. Last checked 15 October 2026.
- Power
- 850W
- Efficiency
- 80 PLUS Gold
- Modular cables
- Fully modular
- ATX version
- ATX 3.1
56 of 66 fields known.
General
- Model numbers
- SRP-CGX851-A5A32SF, SRP-CGX851-A5A32SF-W3Retailer pageeshop.enzure.se/seasonic-850w-seasonic-core-srp-cgx851-a5a32sf/cat-p/c/p1005186250Read 15 October 2026Article number SRP-CGX851-A5A32SF, the black unit.8Retailer pageldlc.com/en/product/PB00657446.htmlRead 15 October 2026Model SRP-CGX851-A5A32SF for the black Seasonic CORE GX ATX 3 (2024) 850 W. The page says the product was referenced on December 5, 2024.10Retailer pageparadigit.ie/seasonic-core-gx-atx3-1-white-850-w/21750146/productRead 15 October 2026Product number manufacturer SRP-CGX851-A5A32SF-W for the white unit.
- GTIN / EAN
- 4711173878476, 47111738787283Retailer pageeshop.enzure.se/seasonic-850w-seasonic-core-srp-cgx851-a5a32sf/cat-p/c/p1005186250Read 15 October 2026EAN 4711173878476 for SRP-CGX851-A5A32SF (black). The check digit is valid.9Retailer pagemultitronic.fi/en/products/4589683/seasonic-core-gx-850w--virtalahde--80-plus-goldRead 15 October 2026EAN 4711173878728, product colour white. The check digit is valid.
- Announced
- 6 December 20242Press releasefunkykit.com/news/seasonic-launches-updated-core-atx-3-psu-series-with-atx-3-1-and-pcie-gen-5-1Read 15 October 2026Press release dated December 6, 2024.
- Predecessor
- Not available
- Successor
- Not available
- Launch price (US)
- From $129.992Press releasefunkykit.com/news/seasonic-launches-updated-core-atx-3-psu-series-with-atx-3-1-and-pcie-gen-5-1Read 15 October 20269Retailer pagemultitronic.fi/en/products/4589683/seasonic-core-gx-850w--virtalahde--80-plus-goldRead 15 October 202610Retailer pageparadigit.ie/seasonic-core-gx-atx3-1-white-850-w/21750146/productRead 15 October 2026
- Launch price (EU)
- From €129.92Press releasefunkykit.com/news/seasonic-launches-updated-core-atx-3-psu-series-with-atx-3-1-and-pcie-gen-5-1Read 15 October 20269Retailer pagemultitronic.fi/en/products/4589683/seasonic-core-gx-850w--virtalahde--80-plus-goldRead 15 October 202610Retailer pageparadigit.ie/seasonic-core-gx-atx3-1-white-850-w/21750146/productRead 15 October 2026
- Colours
- Black, White2Press releasefunkykit.com/news/seasonic-launches-updated-core-atx-3-psu-series-with-atx-3-1-and-pcie-gen-5-1Read 15 October 2026Available in black and white.
- Form factor
- ATX3Retailer pageeshop.enzure.se/seasonic-850w-seasonic-core-srp-cgx851-a5a32sf/cat-p/c/p1005186250Read 15 October 2026The page copies Seasonic's spec table. Form Factor ATX/EPS, 140 x 150 x 86 mm, which is the ATX back face of 150 x 86 mm.6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Type ATX12V.
- ATX version
- ATX 3.12Press releasefunkykit.com/news/seasonic-launches-updated-core-atx-3-psu-series-with-atx-3-1-and-pcie-gen-5-1Read 15 October 2026The units comply with the latest ATX 3.1 and PCIe Gen 5.1 standards.7Certification listclearesult.com/80plus/sites/80plus/files/manufacturer-certificate/SEA%20SONIC%20ELECTRONICS%20CO.%20LTD._SRP-CGX851-A5A32SF_850W_SOCE%207565_Report_0.pdfRead 15 October 2026The list names the form factor ATX 3.1.
- PCIe CEM version
- PCIe 5.12Press releasefunkykit.com/news/seasonic-launches-updated-core-atx-3-psu-series-with-atx-3-1-and-pcie-gen-5-1Read 15 October 2026The units comply with PCIe Gen 5.1.
- Modular cables
- Fully modular2Press releasefunkykit.com/news/seasonic-launches-updated-core-atx-3-psu-series-with-atx-3-1-and-pcie-gen-5-1Read 15 October 202680 Plus Gold certified units with a fully modular design and color-matching cables with a braided pattern.6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Cable Design Fully Modular.
Power
- Rated continuous power
- 850W3Retailer pageeshop.enzure.se/seasonic-850w-seasonic-core-srp-cgx851-a5a32sf/cat-p/c/p1005186250Read 15 October 2026Total continuous power 850 W.6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Manufacturer-provided information: Rated Power 850 W.
- Full power rated up to
- 40°C3Retailer pageeshop.enzure.se/seasonic-850w-seasonic-core-srp-cgx851-a5a32sf/cat-p/c/p1005186250Read 15 October 2026Operating Temperature 0 - 50 C, with derating from 100 % to 80 % linearly from 40 C to 50 C. Full power is therefore rated up to 40 C.4Retailer pageinside-tech.co.uk/power-supplies-2/seasonic-core-gx-v4-850w-80-plus-gold-atx-3-1-modular-psu-with-120mm-fdb-fan-braided-cables-7-year-warranty-blackRead 15 October 2026Operating Temperature 0 - 50 C (derating from 100 % to 80 % from 40 C to 50 C linearly).
- 12V rail design
- Single rail6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Power Specifications: one +12V column with 70 A and 840 W, and one 12V OCP result.
- +12V max current
- 70A3Retailer pageeshop.enzure.se/seasonic-850w-seasonic-core-srp-cgx851-a5a32sf/cat-p/c/p1005186250Read 15 October 2026DC output: +3.3 V 20 A, +5 V 20 A, +12 V 70 A, -12 V 0.3 A, +5 VSB 3 A.5Reviewkitguru.net/components/power-supplies/zardon/seasonic-core-gx-850-atx-3-reviewRead 15 October 2026Page 3: the +12V rail can deliver 70 A and the +3.3V and +5V 20 A, for a total of 850 W.6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Power Specifications table: +12V 70 A.
- +12V max power
- 840W4Retailer pageinside-tech.co.uk/power-supplies-2/seasonic-core-gx-v4-850w-80-plus-gold-atx-3-1-modular-psu-with-120mm-fdb-fan-braided-cables-7-year-warranty-blackRead 15 October 2026The page copies Seasonic's spec table. DC output maximum power: +12 V 840 W, with 100 W, 3.6 W and 15 W for the other rows. The listing text names the white version.6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Power Specifications table: +12V 840 W.
- +3.3V and +5V combined power
- 100W4Retailer pageinside-tech.co.uk/power-supplies-2/seasonic-core-gx-v4-850w-80-plus-gold-atx-3-1-modular-psu-with-120mm-fdb-fan-braided-cables-7-year-warranty-blackRead 15 October 2026Power output row prints 100 W once for the +3.3 V and +5 V rails, so it is one shared limit.6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Power Specifications table: one merged 100 W cell for 3.3V and 5V, 20 A each.
- +5V standby current
- 3A3Retailer pageeshop.enzure.se/seasonic-850w-seasonic-core-srp-cgx851-a5a32sf/cat-p/c/p1005186250Read 15 October 2026DC output: +5 VSB 3 A.6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Power Specifications table: 5VSB 3 A, 15 W.
- AC input voltage
- Lowest100Highest240V3Retailer pageeshop.enzure.se/seasonic-850w-seasonic-core-srp-cgx851-a5a32sf/cat-p/c/p1005186250Read 15 October 2026AC input 100 V - 240 V, 11 - 5.5 A, 50 Hz - 60 Hz.4Retailer pageinside-tech.co.uk/power-supplies-2/seasonic-core-gx-v4-850w-80-plus-gold-atx-3-1-modular-psu-with-120mm-fdb-fan-braided-cables-7-year-warranty-blackRead 15 October 2026AC input 100 V - 240 V, 11 - 5.5 A, 50 Hz - 60 Hz.6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Manufacturer-provided information: 100-240 Vrms, 5.5-11 A, 50-60 Hz.
- Alternative low power mode (ALPM)
- Yes6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Temperature and Compliance Info: ALPM compatible, checked.
Certifications
- Cybenetics efficiency at 115V
- Cybenetics Platinum6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Report issued Mar 6, 2025, lab ID SS85002750. The database name is Core GX-850 ATX3 and the report has no sample serial. The database lists ETA Platinum at 115V. The sample has the fan, capacitors and cable set of the CORE GX-850 that KitGuru reviewed.
- Cybenetics efficiency at 230V
- Cybenetics Platinum6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026The database lists ETA Platinum at 230V.
Measured
- Average efficiency at 115V (measured)
- 89.073%6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Average over more than 1450 load combinations at 115V. Sample received Feb 11, 2025, tested Feb 20, 2025, ambient 28-32 C.
- Average efficiency at 230V (measured)
- 91.095%6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Average over more than 1450 load combinations at 230V.
- Light-load efficiency at 115V (measured)
- 71.934%6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Efficiency at 2% load (more than 500 W unit) at 115V.
- Average power factor at 115V (measured)
- 0.9776Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Average over more than 1450 load combinations at 115V. At 230V it is 0.943.
- Average noise at 115V (measured)
- 28.17dB(A)6Measurementcybenetics.com/evaluations/psus/2750Read 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 28.19 dBA.
- Noise at full load at 115V (measured)
- 43.7dB(A)6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Typical load tests at 115V, 100% load row: 43.7 dB(A) at 1729 rpm fan speed, 45.73 C intake temperature.
- Standby power with no load at 115V (measured)
- 0.0665W6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Standby power consumption at 115V with no load on +5VSB: 0.0665 W. At 230V it is 0.1740 W.
- Hold-up time (measured)
- 18ms6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Hold-Up Time and PWR_OK Signal: hold-up time 18.0 ms, AC loss to PWR_OK 14.7 ms.
- 12V ripple at full load (measured)
- 28.89mV6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Non-accredited. 12V ripple at full load at 115V. At 230V it is 29.48 mV.
- 12V load regulation (measured)
- 1.14%6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Non-accredited. 12V load regulation at 115V. At 230V it is 1.13%.
Cables and connectors
- Cables
Connector Connectors Cables Length to first plug (mm) Wire gauge Rated power (W) ATX 24-pin (20+4) 1 1 610 16-18AWG Not available CPU 8-pin (EPS, 4+4) 2 2 750 16AWG Not available PCIe 8-pin (6+2) 1 1 750 16-18AWG Not available PCIe 8-pin (6+2) 2 1 700 16-18AWG Not available 12V-2x6 1 1 700 16AWG 600 SATA power 6 2 455 18AWG Not available 4-pin Molex 3 1 455 18AWG Not available Source5Reviewkitguru.net/components/power-supplies/zardon/seasonic-core-gx-850-atx-3-reviewRead 15 October 2026Page 2 shows Seasonic's Cable Summary slide for the CORE GX ATX 3, 850 W column: MB 610 mm 1 cable with 20+4 pins, CPU 750 mm 2 cables with 4+4 pins, 12V-2x6 700 mm 1 cable, PCIe 750 mm 1 cable with 6+2 pins, PCIe 700 mm 1 cable with 16 pins to 2 x 6+2 pins, SATA 750 mm 2 cables with 3 connectors, Molex 690 mm 1 cable with 3 connectors. The review says both connector types support up to 600 W. The SATA and Molex lengths run to the last plug, so the first-plug lengths come from the Cybenetics report (455 mm for both). The page 3 photo of the modular panel shows one 12-pin PCIe socket, so the 16-pin to dual 8-pin cable shares that socket with the native 12V-2x6 cable. Wire gauges come from Cybenetics.6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Cables and Connectors table: ATX 20+4 pin 620 mm 16-18AWG, 2 x 4+4 pin EPS12V 750 mm 16AWG, one cable with 2 x 6+2 pin PCIe plugs 710 mm 16-18AWG, one 6+2 pin PCIe 750 mm 16-18AWG, 12+4 pin PCIe 700 mm (600W) 16-28AWG, 2 SATA cables of 455+155+155 mm with 6 plugs, one 4-pin Molex cable of 455+125+125 mm with 3 plugs, 18AWG, no in-cable capacitors. The 16-28AWG range of the 12V-2x6 cable includes the thin sideband wires, so the stored gauge is the 16AWG power wire. Seasonic's slide lengths are stored where they are first-plug lengths. Cybenetics measured 620 mm for the 24-pin cable and 710 mm for the dual 8-pin cable.8Retailer pageldlc.com/en/product/PB00657446.htmlRead 15 October 2026Power connectors: 2 x +12V (P8, 2 x P4), 6 x Serial ATA, 1 x ATX 20+4 pin, 3 x Molex (4 pin), 3 x PCI Express 6+2 pin, 1 x PCI Express 16 pin (12V-2x6).- CPU (EPS) connectors
- 2
- PCIe 8-pin connectors
- 3
- 16-pin GPU connectors
- 1
- SATA power connectors
- 6
- 4-pin Molex connectors
- 3
- Cable style
- Sleeved3Retailer pageeshop.enzure.se/seasonic-850w-seasonic-core-srp-cgx851-a5a32sf/cat-p/c/p1005186250Read 15 October 2026Cable type: Individual Black Cables with Braided Pattern.5Reviewkitguru.net/components/power-supplies/zardon/seasonic-core-gx-850-atx-3-reviewRead 15 October 2026The cables are individually braided.
Fan
- Fan size
- 120mm2Press releasefunkykit.com/news/seasonic-launches-updated-core-atx-3-psu-series-with-atx-3-1-and-pcie-gen-5-1Read 15 October 2026A 120 mm hydro dynamic bearing fan with Seasonic's Smart and Silent Fan Control.3Retailer pageeshop.enzure.se/seasonic-850w-seasonic-core-srp-cgx851-a5a32sf/cat-p/c/p1005186250Read 15 October 2026Fan Size 120 mm, Fan Control Smart and Silent Fan Control, life expectancy 25,000 hours at 40 C.5Reviewkitguru.net/components/power-supplies/zardon/seasonic-core-gx-850-atx-3-reviewRead 15 October 2026Page 4: Hong Hua 120 mm Hydro (Fluid) Dynamic Bearing fan, 12 V, 0.58 A, up to 2,200 rpm, model HA1225H12F-Z.6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Fan Hong Hua HA1225H12F-Z, 120 mm.
- Fan bearing
- Hydrodynamic (HDB)2Press releasefunkykit.com/news/seasonic-launches-updated-core-atx-3-psu-series-with-atx-3-1-and-pcie-gen-5-1Read 15 October 2026Hydro dynamic bearing fan, 120 mm.3Retailer pageeshop.enzure.se/seasonic-850w-seasonic-core-srp-cgx851-a5a32sf/cat-p/c/p1005186250Read 15 October 2026Fan Bearing: Hydro Dynamic Bearing.5Reviewkitguru.net/components/power-supplies/zardon/seasonic-core-gx-850-atx-3-reviewRead 15 October 2026Page 4: Hong Hua 120mm Hydro (Fluid) Dynamic Bearing (HDB).6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Fan Hong Hua HA1225H12F-Z, 120 mm, 12 V, 0.58 A, listed as a Fluid Dynamic Bearing fan. Seasonic names it a Hydro Dynamic Bearing.
- Fan mode
- Always on5Reviewkitguru.net/components/power-supplies/zardon/seasonic-core-gx-850-atx-3-reviewRead 15 October 2026Page 3: no Hybrid fan control is offered with this unit. The fan spins very slowly at low power and the unit is not audible below about 650 W. Some retailers print a semi-fanless row. Quiet PC copies the same row for the 650, 750 and 850 W columns, even printing 850 W power output in the 650 W column, so it is not used.6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Semi-Passive Operation is not ticked. The typical load tests show 836 rpm at 10 percent load and 833 rpm at 20 percent, so the fan always spins.
Protection and parts
- Protections
- 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)3Retailer pageeshop.enzure.se/seasonic-850w-seasonic-core-srp-cgx851-a5a32sf/cat-p/c/p1005186250Read 15 October 2026Protection: OPP, OCP, OTP, OVP, SCP, UVP.5Reviewkitguru.net/components/power-supplies/zardon/seasonic-core-gx-850-atx-3-reviewRead 15 October 2026Page 4: OPP, OVP, UVP, OCP, OTP and SCP.6Measurementcybenetics.com/evaluations/psus/2750Read 15 October 2026Protection Features (Manufacturer): OPP, +12V OCP, OTP, SCP, surge and inrush protection. The protection tests tick NLO and SIP (surge MOV, inrush NTC and bypass relay). Fan failure protection is not present. The report has no UVP row, so OVP and UVP come from the maker.
- All-Japanese capacitors
- Not available
- MTBF (claimed)
- 100,000h3Retailer pageeshop.enzure.se/seasonic-850w-seasonic-core-srp-cgx851-a5a32sf/cat-p/c/p1005186250Read 15 October 2026MTBF at 25 C, excluding the fan: 100,000 hours.4Retailer pageinside-tech.co.uk/power-supplies-2/seasonic-core-gx-v4-850w-80-plus-gold-atx-3-1-modular-psu-with-120mm-fdb-fan-braided-cables-7-year-warranty-blackRead 15 October 2026MTBF at 25 C, excl. fan 100,000 hours.
Monitoring and lighting
- Software monitoring
- Not available
- Software
- Not available
- Built-in power display
- Not available
Dimensions and weight
Front and side, drawn to scale.
- Dimensions
- Width150Height86Depth140mm(5.9 × 3.4 × 5.5 in)3Retailer pageeshop.enzure.se/seasonic-850w-seasonic-core-srp-cgx851-a5a32sf/cat-p/c/p1005186250Read 15 October 2026140 mm (L) x 150 mm (W) x 86 mm (H). Depth 140, width 150, height 86. The page lists the Cybenetics levels as TBA, so those fields come from the Cybenetics report.5Reviewkitguru.net/components/power-supplies/zardon/seasonic-core-gx-850-atx-3-reviewRead 15 October 2026Page 3: 140 mm x 150 mm x 86 mm.8Retailer pageldlc.com/en/product/PB00657446.htmlRead 15 October 2026Height 86 mm.
- Weight
- Not available
In the box
- In the box
- Cable ties, Screws for mounting, Regional specific power cable, Literature5Reviewkitguru.net/components/power-supplies/zardon/seasonic-core-gx-850-atx-3-reviewRead 15 October 2026Page 2: the box contains some cable ties, screws for mounting, a regional specific power cable and some literature, with the cables set to one side. Review dated December 31, 2024.
Links
- Product page
- seasonic.com/core-gx-atx-3-20241Maker product pageseasonic.com/core-gx-atx-3-2024Read 15 October 2026Seasonic's site is blocked for agents, so the page text was not read. The link is the CORE GX ATX 3.1 family page that search results name for this unit. The specs come from Seasonic's launch release, retailer copies of Seasonic's spec table, a cable slide printed in a review, the 80 PLUS list and the Cybenetics report.
- Spec sheet
- Not available
- Manual
- Not available
- EPREL registration number
- Not available
Warranty
- Manufacturer warranty (source market)
- 7years2Press releasefunkykit.com/news/seasonic-launches-updated-core-atx-3-psu-series-with-atx-3-1-and-pcie-gen-5-1Read 15 October 2026Sea Sonic's 7-year worldwide manufacturer's warranty.3Retailer pageeshop.enzure.se/seasonic-850w-seasonic-core-srp-cgx851-a5a32sf/cat-p/c/p1005186250Read 15 October 2026Warranty 7 Years.5Reviewkitguru.net/components/power-supplies/zardon/seasonic-core-gx-850-atx-3-reviewRead 15 October 2026Closing page: the Core GX range comes with a 7 year warranty.
Compare with
Pick a power supply to see both side by side. Differences are marked yellow.
Variants
Each variant lists only what differs from the specs above.
| Model number | GTIN | Launch price (US) | Launch price (EU) | Markets | Colours |
|---|---|---|---|---|---|
| SRP-CGX851-A5A32SF | 4711173878476 | $129.99 | €129.9 | US, EU | Black |
| SRP-CGX851-A5A32SF-W | 4711173878728 | Not available | Not available | Not available | White |
Sources
We read 10 sources for this power supply. The numbers match the markers in the sheet.
- Maker product pageseasonic.com/core-gx-atx-3-2024
- Measurementcybenetics.com/evaluations/psus/2750
- Retailer pageldlc.com/en/product/PB00657446.html
See a wrong value? Tell us and name the field.