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Compact silver SFX power supply unit with modular cable connectors and cooling fan visible

Corsair

Corsair SF850 SFX power supply CP-9020256-NA

SKU CH-KFY0-1XNGH MPN CP-9020256-NA

An 850 W SFX power supply with 80 PLUS Platinum efficiency, fully modular cabling, a 92 mm PWM fan with Zero RPM mode, 105 °C Japanese capacitors, ATX 3.1 and PCIe 5.1 readiness.

  • Max wattage850 W
  • Modular cablingFull Modular
  • Fan configuration92 mm PWM cooling fan
  • PSU length limit125 mm
  • Efficiency certification80 PLUS PLATINUM Certified
  • Supply voltage100–240 V

Model 850W

  • 80 PLUS Platinum efficiency reduces energy waste
  • 850 W output supports high-end components in small builds
  • Fully modular Type-5 cables keep the interior tidy
  • 92 mm PWM fan with Zero RPM mode stays silent at low load
  • 105 °C Japanese capacitors rated for 50 °C continuous operation

SF850 850 W SFX power supply

This Corsair SF Series unit delivers 850 W in the compact SFX form factor. It carries 80 PLUS Platinum certification and meets ATX 3.1 and PCIe 5.1 specifications. A 92 mm PWM fan provides cooling with a Zero RPM mode at low load. Japanese capacitors rated for 105 °C support continuous operation at 50 °C.

Ideal for high-performance small-form-factor builds

The fully modular design with Type-5 Micro-Fit connectors suits compact systems that need substantial headroom for modern GPUs and CPUs. Builds constrained to smaller SFX volumes or lower wattage requirements should consider other models in the range. The SFX-to-ATX bracket allows installation in standard ATX cases when needed.

Check case clearance and cable routing

Verify the chassis accepts a 125 mm deep SFX unit and plan routing for the 300 mm ATX 24-pin cable alongside 400 mm EPS and PCIe leads. Confirm the motherboard and graphics card use standard 24-pin, 8-pin EPS and 12+4-pin PCIe connectors. Ensure the 100-240 V input matches local mains supply.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $164.99
Pricier than about 55% of the 10,869 comparable items (median $142.99).
Max wattage 850 W
Typical for this category: the median of 930 items is 850 W.

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Specifications

Product
Brand nameCORSAIR
Product lineSF Series
Model nameCP-9020256-NA
Product typeSFX
Ports & slots
Output type+3.3 V@20A, +5 V@20A, +5VSB@3A
Connection types1 x ATX Cable (24-PIN) (24): 300 mm
2 x EPS/ATX12 V Cable (8-PIN) (4+4): 400 mm
3 x PCI-E Cable (8-PIN) (6+2): 400 mm
1 x PCI-E Cable (12+4)PIN: 400 mm
1 x SATA CABLE (4 Straight: 100 mm, 115 mm, 115 mm, 115 mm
1 x SATA CABLE (4 Right SATA): 100 mm, 115 mm, 115 mm, 115 mm
1 x PATA-PATA-PATA: 100 mm, 115 mm, 115 mm
Power
Max wattage850 W
Modular cablingFull Modular
Efficiency certification80 PLUS PLATINUM Certified
Supply voltage100–240 V
AC input frequency47–63 Hz
Rated input current10A-5A
Size & build
Product dimensions4.92 × 3.94 × 2.5 in
Product weight2.31 lb (1.05 kg)
Shipping weight2.18 kg
Package size311 × 159 × 105 mm
Compatibility
PSU length limit125 mm
In the box
Included itemsSF850 Power Supply | DC Cable Kit | SFX-ATX Adapter Bracket | Power Cord | Mounting Screws | Cable Ties
More details
Fan configuration92 mm PWM cooling fan

Other versions of this model

5 more in the same range

Questions about this item

Does the SF850 require an SFX-to-ATX bracket if my case only fits standard ATX power supplies?

Yes, an SFX-to-ATX adapter bracket is included in the package so the 125 mm SFX unit can mount in a regular ATX opening.

Will the 12+4 pin PCIe 5.1 connector work with my older graphics card that uses an 8-pin plug?

The supply also ships with three 6+2 pin PCIe cables, so you can power legacy cards without using the new 12+4 pin lead.

How can I confirm the fan’s Zero RPM mode is active after I build the system?

Under light loads the 92 mm PWM fan stops completely; you will hear no fan noise until the internal temperature rises above the Zero RPM threshold.

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