Corsair SF850 850W ATX Power Supply

Corsair SF850 | Platinum SFX Power Supply for Compact Builds

The Corsair SF850 power supply unit 850 W 24-pin ATX ATX Black delivers 850 watts of ATX 3.1-compliant power in a compact SFX form factor, making it ideal for small-form-factor (SFF) gaming and workstation PCs. With 80 PLUS Platinum efficiency and fully modular cabling, it balances high performance with clean, space-saving installation.

Key Specifications

Compact Power Meets High Efficiency

The SF850 achieves 80 PLUS Platinum certification, meaning it converts at least 90 % of AC power to DC under typical loads. This reduces heat output and electricity costs while maintaining stable delivery for demanding components. Its SFX footprint (125 x 100 x 63.5 mm) fits tight Mini-ITX cases without sacrificing the 850 W capacity needed for high-end GPUs and CPUs.

Fully Modular for Clean Builds

All cables detach at the PSU end, so you install only what your system needs. This cuts clutter inside compact cases, improves airflow, and makes routing easier around tight clearances. The included cables cover ATX, EPS, PCIe (3 x 6+2 pin), SATA, and Molex connections, supporting modern multi-GPU and high-RPM storage setups.

Advanced Cooling with Silent Operation

A 92 mm Fluid Dynamic Bearing (FDB) fan sits at the top and ramps speed based on load. Corsair’s Zero RPM mode keeps the fan off under low-to-medium loads, eliminating noise during everyday use. At full load, the fan maintains safe temperatures without excessive sound, thanks to the unit’s efficient design and Platinum-rated components.

Built-In Protection for Long-Term Reliability

The SF850 includes over-current, over-power, over-voltage, over-temperature, and short-circuit protection. With a Mean Time Between Failures (MTBF) rating of 100,000 hours and FDB fan technology, it’s engineered for years of stable operation under continuous use.

Box Contents

• Corsair SF850 power supply unit
• AC power cable
• Modular cables (ATX, EPS, PCIe, SATA, Molex)
• Mounting screws
• User manual

Check Before You Buy

• Confirm your case supports SFX (not standard ATX) PSUs.
• Verify your GPU(s) total power draw stays under 850 W.
• Check if you need additional PCIe cables for multi-GPU setups.
• Ensure your system’s 24-pin and 8-pin EPS connectors match the included cables.

Frequently Asked Questions

Q: Is the SF850 compatible with ATX 3.1 GPUs?

A: Yes, it meets ATX 3.1 compliance for modern GPU power delivery.

Q: Can I use this in a standard ATX case?

A: Yes, but you must confirm the case has SFX mounting points or adapters.

Q: Does it support overclocked systems?

A: The 850 W capacity and 70.8 A +12V rail suit most overclocked builds.

Q: Is the fan always on?

A: No, Zero RPM mode stops the fan at low loads for silent operation.

Q: What warranty comes with the SF850?

A: It is covered by the standard Manufacturer Warranty.

The Consultant’s Verdict & Warranty

The Corsair SF850 power supply unit 850 W 24-pin ATX ATX Black suits builders prioritising efficiency, compact size, and low noise in SFF or premium ATX systems. Its Platinum rating, fully modular design, and ATX 3.1 compliance make it future-proof for high-performance hardware. Covered by the standard Manufacturer Warranty.