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Corsair sf850 850w sfx atx 3.1 psu 80 plus platinum fully modular 12v-2x6 92mm zero-rpm black
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Description
Item No.
a551b114-599c-434e-b5de-0834b26f5c1c
Corsair SF850 (2024) 850W SFX
850W SFX80 PLUS PlatinumATX 3.1 / 12V-2x692mm Zero-RPM
The Corsair SF850 (2024) is a fully modular 850-watt SFX power supply with 80 PLUS and Cybenetics Platinum efficiency, purpose-built for small-form-factor (SFF) gaming PCs that need full-size performance in a tiny footprint. Carrying the part number CP-9020256-EU, it is ATX 3.1 compliant with a native PCIe 5.1 12V-2x6 GPU cable, 100% Japanese 105°C capacitors and a quiet 92mm fan with Zero RPM mode. A 7-year wa
Details
Corsair SF850 (2024) 850W SFX
850W SFX80 PLUS PlatinumATX 3.1 / 12V-2x692mm Zero-RPM
The Corsair SF850 (2024) is a fully modular 850-watt SFX power supply with 80 PLUS and Cybenetics Platinum efficiency, purpose-built for small-form-factor (SFF) gaming PCs that need full-size performance in a tiny footprint. Carrying the part number CP-9020256-EU, it is ATX 3.1 compliant with a native PCIe 5.1 12V-2x6 GPU cable, 100% Japanese 105°C capacitors and a quiet 92mm fan with Zero RPM mode. A 7-year warranty backs it. Typically in stock with fast delivery across Cyprus.
Compatibility & fit
This is an SFX-format PSU (125 × 100 × 63.5 mm) for small-form-factor cases — it will not fit a standard ATX PSU bay without an SFX-to-ATX adapter bracket (sold separately). It ships with a native PCIe 5.1 12V-2x6 (12+4-pin) GPU cable plus three PCIe 6+2 connectors. Full-range 100–240V input runs natively on Cyprus 230V mains.
Best For
✓Small-form-factor (SFF) and Mini-ITX gaming PCs
✓SFX-bay cases needing 850W of Platinum power
✓PCIe 5.1 builds wanting a native 12V-2x6 cable
✓Compact rigs with a high-end GPU in limited space
✓Silent SFF builds (92mm Zero RPM fan)
✓Reliability-focused systems with 100% Japanese caps
Key Features
Platinum power in SFX size
80 PLUS and Cybenetics Platinum efficiency (noise A-) packed into a compact SFX body — full-size performance for the most power-dense small builds.
ATX 3.1 with native 12V-2x6
ATX 3.1 certified and PCIe 5.1 ready, it includes a native 12V-2x6 GPU cable for modern graphics cards such as the RTX 40/50 series.
92mm Zero RPM fan
A fluid-dynamic-bearing 92mm fan with Zero RPM mode shuts off completely at low to medium loads for silent operation in compact, hot cases.
100% Japanese capacitors
Built with 100% industrial-grade 105°C Japanese capacitors and rated for continuous 50°C operation, with fully modular Type-5 Micro-Fit cabling.
Technical Specifications
| Identification | |
| Part Number | CP-9020256-EU |
| EAN / GTIN | 0840006663287 |
| MPN | CP-9020256-EU |
| Model | SF Series SF850 (2024) |
| Power OuTPUt | |
| Continuous power | 850W |
| +12V rail | 70.8A single rail (850W) |
| +3.3V / +5V | 20A / 20A (130W combined) |
| +5Vsb | 3A |
| Efficiency & Standard | |
| Efficiency rating | 80 PLUS Platinum + Cybenetics Platinum (noise A-) |
| Form factor | SFX |
| ATX standard | ATX 3.1 — PCIe 5.1 |
| GPU connector | Native 12V-2x6 (12+4-pin, PCIe 5.1) |
| Input | 100–240V, 10–5A, 47–63Hz |
| Operating temperature | Up to 50°C continuous |
| Cooling | |
| Fan | 92mm fluid-dynamic-bearing |
| Fan mode | Zero RPM — fan off at low to medium load |
| Cables & Connectors | |
| Cabling | Fully modular — Type-5 Micro-Fit, individually sleeved |
| Motherboard | 1× 24-pin ATX |
| CPU / EPS | 2× EPS 8-pin (4+4) |
| PCIe (GPU) | 1× 12V-2x6 (12+4) + 3× PCIe 6+2-pin |
| Peripheral | 8× SATA, 3× PATA (Molex) |
| Protection & Physical | |
| Form factor | SFX — 125 × 100 × 63.5 mm |
| Weight | 2.30 kg |
| Colour | Black |
| Capacitors | 100% Japanese 105°C |
| Reliability | MTBF 100,000h |
| Warranty | 7 years |
Frequently Asked Questions
Singular Expert Insight
The SF Series is CORSAIR’s go-to range for small-form-factor builds, and the SF850 is the sweet spot: enough power for a high-end SFF gaming PC, Platinum efficiency, and an ATX 3.1 native 12V-2x6 cable, all in a tiny SFX body. If you are building in an ATX case, a standard ATX power supply like the RMx will be cheaper and easier to fit; but for a Genuine SFF / Mini-ITX rig, the SF850 is one of the best units you can buy. Step up to the SF1000 if you need more headroom in the same form factor.
Buyer’s Guide
Buy it if
You are building a small-form-factor or Mini-ITX PC and need 850W of fully modular, ATX 3.1 Platinum power with a native 12V-2x6 cable in an SFX body.
Skip it if
You are building in a standard ATX case — a regular ATX PSU will be cheaper and fit without an adapter bracket.
Also consider
The SF1000 for more SFX headroom, or the SF750 for lower-draw SFF builds.