Corsair SF850 ATX v3.1 PSU Review

The Corsair SF850 is a top performing 850W SFX unit, having Cybenetics Platinum and Cybenetics A-, efficiency and noise ratings. If you want to build a super-strong, mini-sized system, you should include this PSU in your list. 

The Corsair SF850 will be included in my best ATX v3.x & PCIe 5.x PSU picks article.

It was high time for Corsair to enrich its SF line with stronger and ATX v3.1 (SFX12V 4.1) compliant members. The long wait was because Corsair wanted to ensure that the new SFX units would continue the legacy of the previous models, which were among the best in this market segment. This is the case since the SF850 has achieved first place in overall performance among the few SFX and ATX v3.1 compatible units, with 850W max power. As for the SF750 and SF1000, I don’t want to provide any spoilers since I will provide all the details about them in upcoming reviews!

To increase efficiency, make the platform more reliable, and save money, Corsair decided to ditch the -12V rail in these PSUs. This was a wise move since no PC part requires this rail anymore, which is a remnant of the past, and every PSU manufacturer should get rid of it ASAP. From the start of my PSU career, which was a long time ago, I didn’t bother with this rail and mentioned far too many times that it should be abandoned, but only recently have the PSU manufacturers realized that. The PC industry doesn’t easily accept changes that have to do with power delivery, and another fine example of this is the ATX12VO standard, which hasn’t managed so far to vanish the minor rails.

I have evaluated so far the following SFX and SFX-L PSUs:

Technical Specifications:
  • Manufacturer (OEM): Great Wall
  • Max Power: 850W
  • Cybenetics Efficiency: [115V] Cybenetics Platinum (89-91%) [230V] Cybenetics Platinum (91-93%)
  • Noise: Cybenetics A- (25-30 dB[A])
  • Compliance: ATX v3.1, SFX12V 4.1
  • Operating Temperature (Continuous Full Load): 0 – 50 °C
  • Alternative Low Power Mode support: Yes
  • Power 12V combined: 850W
  • Number of 12V rails: 1
  • Power 5V + 3.3v: 130W
  • Power 5VSB: 15W
  • Cooling: 92mm Fluid Dynamic Bearing Fan (NR092P)
  • Semi-Passive Operation: ✓
  • Modular Design: Yes (Fully)
  • High Power Connectors: 2x EPS (2x cables), 3x PCIe 6+2 pin (3x cables), 1x PCIe 12+2 pin (600W)
  • Peripheral Connectors: 8x SATA (2x cables), 3x 4-pin Molex (1x cables)
  • ATX Cable Length: 310mm
  • EPS Cable Length: 410mm
  • 6+2 pin PCIe Cable Length: 400mm
  • 12+4 pin PCIe Cable Length: 410mm
  • Distance between SATA / 4-pin Molex: 100/115mm
  • In-cable capacitors: No
  • Dimensions (W x H x D): 125 mm x 65 mm x 100mm
  • Weight: 0.965 kg (2.13 lb)
  • Warranty: 7-years
  • Street price (excluding VAT): No info at the time of the review

Power Specifications

Rail 3.3V 5V 12V 5VSB
Max. Power Amps 20 20 70.8 3
Watts 130 850 15
Total Max. Power (W) 850
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