Corsair
Corsair HX1200i (ATX 3.1)
1,200 W · 80 PLUS Platinum · Full
8.3
$280Nov 9
Corsair SF850 (ATX 3.1)
An 850 W SFX unit with 80 PLUS Platinum efficiency, a 12VHPWR cable and three 8-pin PCIe connectors for small builds.
- 850 W
- 80 PLUS Platinum
- Full
- ATX 3.1
- SFX
PCPR score
7.8
Good
Best price we’ve seen
$225Nov 9
Checked recently. Confirm at the retailer.
R1
The short version
The SF850 is Corsair's 850 W SFX power supply, rated 80 PLUS and Cybenetics Platinum and certified to ATX 3.1. Its fully modular Type 5 cables include a 12VHPWR connector, three 8-pin PCIe connectors and eight SATA, cooled by a 92 mm fluid dynamic bearing fan with Zero RPM mode and built with 105°C Japanese capacitors. It suits compact builds with power-hungry GPUs and uses Corsair's Type 5 Micro-Fit cables rather than the Type 4 cables on its RMe and RMx units.
Pros
- 80 PLUS and Cybenetics Platinum ratings in an SFX chassis
- 12VHPWR cable plus three 8-pin PCIe connectors
- Zero RPM mode with a 92 mm fluid dynamic bearing fan
- 105°C-rated Japanese capacitors
Cons
- Seven-year warranty, shorter than Corsair's RMx line
- Corsair's page lists no dimensions
- Type 5 Micro-Fit cables differ from the Type 4 cables on Corsair's RMe and RMx units
Best for
- Small form factor builds with high-end GPUs
- SFX cases that need 850 W
J3
Full specifications
Core
- Wattage
- 850 W
- Form factor
- SFX
- Efficiency
- 80 PLUS Platinum
- ATX standard
- ATX 3.1
Features
- Modularity
- Full
- Warranty
- 7 years
Connectivity
- 12V-2x6 / 16-pin
- 1
- PCIe 8-pin
- 3
- EPS 8-pin
- 2
- SATA power
- 8
- Molex
- 3
Cooling
- Fan size
- 92 mm
- Zero-RPM mode
- Yes
Physical
- Color
- Black
Compatibility notes
- SFX form factor
- Type 5 Micro-Fit modular cables, not the Type 4 cables used on Corsair's RMe and RMx units
- Corsair's spec table omits dimensions, so length is left unknown
P1
Where to buy
Official store
Seen Nov 9, 2026
$224.99
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AV1
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R9
Common questions
Will the SF850 fit my mini-ITX case?
It uses the SFX form factor. Corsair's product page does not print its dimensions, so confirm your case accepts standard SFX power supplies before buying.
Does the SF850 support ATX 3.1 and PCIe 5.1?
Yes. Corsair lists it as ATX 3.1 compliant with PCIe 5.1 support, and it includes one 12VHPWR cable for compatible graphics cards.
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