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Corsair · 850 W · SFX

CORSAIR SF850

ATX 3.1 · 80 PLUS Platinum · Modular

Capability
69
Cap / price
38
Wattage value
38
Amazon
$180
CORSAIR SF850
View CORSAIR SF850 Gallery in high resolution
$180
Available on Amazon Updated Aug 30, 2026 Prime FBA
Capability69.2
Capability / price38.5
Wattage value37.8
$180 on Amazon PSU table Compare this PSU

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Written analysis

CORSAIR SF850 at a glance

The CORSAIR SF850 is a 850 W SFX power supply built to the ATX 3.1 generation. Efficiency is listed as 80 PLUS Platinum. Cables are modular. It supports fan-stop at low load.

The calculated capability score is 69.2, averaging the available wattage, recorded efficiency percentage, and warranty inputs against fixed references. Listed warranty is 7 years. +12V output is 71 A.

Best fit: Performance desktops whose calculated component load fits comfortably within a 750–999 W supply.

Platform and cooling

Dimensions are listed as 4.92 x 3.94 x 2.5 inches. Cooling fan size is 92 mm. The unit uses 1 +12V rail at up to 71.00 A per rail. Certifications include 80 PLUS® Platinum.

Current value

At $180, price per kilowatt is $211.75. Capability / price is 38.5 and wattage value is 37.8. Compare nearby supplies below; wattage alone does not determine value.

Unit data

Full specifications

Wattage, efficiency, platform size, electrical outputs, connectors, cooling, and value in one technical sheet.

General

Manufacturer
Corsair
PSU
CORSAIR SF850
Launch price
—
Amazon price
$180
Amazon availability
Available
Price updated
Aug 30, 2026

Power & efficiency

Wattage
850 W
Efficiency
80 PLUS Platinum
Recorded efficiency
92%
Warranty
7 years

Value

Amazon price
$180
Price / kW
$211.75
Capability
69.2
Capability / price
38.5
Wattage value
37.8

Platform & size

ATX generation
3.1
Form factor
SFX
Dimensions
4.92 x 3.94 x 2.5 inches
Modular
Yes
Fanless
No

Electrical

Input voltage
100-240
+12V output
71 A
+5V output
20 A
+3.3V output
20 A
+12V rails
1
Max amps / rail
71.00 A

Cooling & build

Fan size
92 mm
Fan stop
Yes
Certifications
80 PLUS® Platinum

Additional information

Also listed as
SF850
Color
Black

Amazon

Price history

Nearby capability

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Vendor copy

Amazon listing details

Marketplace feature text kept for reference. Structured specifications above are the source for scores and comparisons.

80 PLUS Platinum Rated SFX Power: Massive Platinum-rated power in a compact SFX form-factor, perfect for the most power-dense small-form-factor PCs or saving space in larger cases

ATX 3.0 Compliant & PCIe 5.0 Ready: Compliant with the ATX 3.0 power standard from Intel, supporting the PCIe Gen 5 platform and resisting transient power spikes

Fully Modular, Type-5 Micro-Fit PSU Connectors: With flexible cabling, taking up less space for tidy cable management and compatibility in small cases

92mm PWM Cooling Fan: Delivers powerful cooling with low-noise operation thanks to a fluid dynamic bearing

105°C Rated Japanese Capacitors: For unwavering power and reliability

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