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:
- Corsair SF850L SFX-L PSU Review – The BEST SFX-L PSU
- Corsair SF1000L SFX-L PSU Review
- Asus ROG Loki SFX-L 850W PSU Review
- Thermaltake Toughpower SFX 750W Gold PSU Review
- Thermaltake Toughpower SFX 850W Gold PSU Review
- Thermaltake Toughpower SFX(L) 1000W Gold PSU Review
- Cooler Master V1300 SFX Platinum – The STRONGEST SFX PSU!
- Cooler Master V1100 SFX Platinum
- Lian Li SP850 SFX PSU Review – High Performance Through Hell(y)fire?
- Raijintek Ermis 450B Review. A Highly Affordable SFX PSU
- 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 | |||||
Hello, I am in awe of your detailed reviews! Thank you for your work!
About this power supply: so it’s safe to say it’s one of the best? The minuses you mentioned – do they cause any inconvenience for the average PC user? Or are they just your comments that the company could have fixed to make the power supply perfect?
My build at the moment (with further upgrades to come):
AMD Ryzen 9 9900X
AMD Radeon RX 7800 XT 16GB
G.SKILL Ripjaws M5 Neo RGB Matte Black
DDR5 6000MHz 32GB
NOCTUA NH-D15S
WD Black SN770 1TB M.2 NVMe
In the future I plan to change the processor and graphics card. I have very significant difficulties with the choice of power supply, because when you buy it – expect to work for a long time and without headaches).
Translated with DeepL.com (free version)
it is one of the best SFX units, yes