Reliable 850W power for modern gaming PCs. The Seasonic CORE GX-850 ATX 3.1 is a black, fully modular power supply designed for current desktop systems. It combines 80 PLUS Gold efficiency, a native 12V-2×6 GPU power cable, PCIe 5.1 compatibility and Seasonic Smart and Silent Fan Control in a compact ATX enclosure.
Key features
- 850W continuous output: delivers up to 840W on the +12V rail for CPU and graphics-card power.
- Modern GPU connection: includes a native 12V-2×6 cable supporting up to 600W power delivery when used with compatible graphics cards.
- ATX 3.1 and PCIe 5.1: designed for modern power excursions and current GPU platforms.
- 80 PLUS Gold: certified for Gold-level power-supply efficiency; the 850W model is also listed with Cybenetics Platinum efficiency and A- noise ratings.
- Fully modular cabling: connect only the cables required for the build. Black braided-pattern cables match the PSU.
- 120mm Hydro Dynamic Bearing fan: paired with Smart and Silent Fan Control for temperature-responsive cooling.
- OptiSink design: revised internal component and PCB layout improves thermal transfer and airflow.
- Protection circuits: Over Current (OCP), Over Power (OPP), Over Temperature (OTP), Over Voltage (OVP), Short Circuit (SCP) and Under Voltage (UVP) protection.
Technical specifications
| Model Name | Seasonic CORE GX-850 ATX 3.1 (CORE V2) |
|---|---|
| Manufacturer Part Number | SRP-CGX851-A5A32SF |
| Product Type | ATX/EPS desktop power supply |
| Rated Continuous Power | 850W |
| Efficiency Certifications | 80 PLUS Gold; Cybenetics Efficiency Platinum |
| Cybenetics Noise Rating | A- |
| Standards | ATX 3.1 and PCIe 5.1 |
| Modularity | Fully modular |
| Colour / Cable Type | Black PSU with individual black braided-pattern cables |
| GPU Power Cable | Native 12V-2×6 cable; up to 600W with compatible GPU |
| Fan Size / Bearing | 120mm / Hydro Dynamic Bearing |
| Fan Control | Smart and Silent Fan Control (S²FC) |
| Dimensions | 140 × 150 × 86mm (L × W × H) |
| AC Input | 100–240V AC, 50–60Hz, 11–5.5A |
| DC Output Rails | +3.3V: 20A; +5V: 20A; +12V: 70A (840W); -12V: 0.3A; +5VSB: 3A |
| Combined +3.3V / +5V Output | 100W |
| Operating Temperature | 0–50°C; output derating applies above 40°C |
| MTBF (excluding fan) | 100,000 hours at 25°C |
| Fan Life Expectancy | 25,000 hours at 40°C, 15–65% relative humidity |
| Protection | OCP, OPP, OTP, OVP, SCP, UVP |
| Safety / Compliance | cTUVus, TUV, CE, BSMI, CCC, UKCA, EAC; ErP Lot 6, WEEE, RoHS, REACH |
| الضمان | 7 Years |
Compatibility notes
- Check the combined power requirements of the CPU and GPU before choosing a PSU wattage.
- Use the native 12V-2×6 cable only with a compatible graphics card and follow the GPU manufacturer’s connection instructions.
- For older graphics cards, use only the included compatible cable or adapter and follow the supplied installation guidance.
- Use only modular cables specified for this exact power-supply model; modular PSU cables are not universally interchangeable.











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