Corsair SF850 ATX v3.1 PSU Review

Part Analysis

General Data
Manufacturer (OEM) Great Wall
PCB Type Double-Sided
Primary Side
Transient Filter 2x Y caps, 2x X caps, 2x CM chokes, 1x MOV
Inrush Protection 1x NTC Thermistor SCK-056 (5 Ohm) & Relay
Bridge Rectifier(s)
2x Vishay GBUE2560 (600V, 25A @ 140°C)
APFC MOSFETs

1x Infineon IPW60R060C7 (650V, 22A @ 100°C, Rds(on): 0.060Ohm)
1x Champion CM03X (reduce the no-load consumption)

APFC Boost Diode
1x Infineon IDH10G65C6 (650V, 10A @ 140°C)
Bulk Cap(s)
1x Rubycon (420V, 550uF, 3,000h @ 105°C, MXK)
Main Switchers
2x Fuji Power MOSFET FMP60N094S2FDHF (600V, 20.7A @ 100°C, 0.094Ohm)
APFC Controller Champion CM6502UHHX
Resonant Controller Champion CM6901X
IC Driver 1x Novosense NSi6602BD
Topology
Primary side: APFC, Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V MOSFETs 6x Infineon BSC014N04LS (40V, 125A @ 100°C, Rds(on): 1.4mOhm)
5V & 3.3V DC-DC Converters: 4x Advanced Power AP4024GEMT (30V, 60A, Rds(on): 4.5mOhm)
PWM Controller(s): ANPEC APW7159C
Filtering Capacitors Electrolytic: 2x Rubycon (3-6,000h @ 105°C, YXG)
Polymer: 3x United Chemi-Con, 40x FPCAP
Supervisor IC IN1S429I-SCG (OCP, OVP, UVP, SCP, PG)
Fan Controller Microchip PIC16F1824
Fan Model Corsair NR092P (92mm, 12V, 0.22A, Fluid Dynamic Bearing Fan)
5VSB Circuit
Rectifier
1x Infineon ICE5QR1680AG (800V, 5.8A, Rds(on): 1.75Ohm)
Standby PWM Controller Infineon ICE5QR1680AG

Great Wall is the OEM of all SF and SF-L units. It is a Chinese government-owned company, so it has plenty of resources. The PCB is small and densely populated with components to deliver 850W max power. The primary heatsink, hosting, among other things, the bridge rectifiers, is pretty large, while the heatsink on the secondary side is small since the FETs that regulate the 12V rail are installed on the PCB’s bottom side. Overall, the build quality is high, with expensive parts and nearly impeccable soldering quality. Great Wall has state-of-the-art production lines, so I didn’t expect anything less in soldering quality. I had the chance to visit all of GW’s factories and production lines in 2023, and the production of the new SF line took place at the time of my visit.

The design is typically found in every modern PSU nowadays. A half-bridge topology on the primary side, after the APFC converter’s stage, while an LLC resonant converter boosts efficiency through an (almost) lossless switching. A synchronous rectification scheme, including six Infineon FETs, on the secondary side, regulates the 12V rail. The minor rails are generated from a pair of DC-DC converters utilizing an ANPEC PWM controller. Rubycon provides the few electrolytic caps on the secondary side, while many polymer caps handle ripple filtering. The fan controller is a Microchip digital controller, making the fan speed profile programming easy. The cooling fan uses a fluid dynamic bearing and has a diameter of 92mm. Lastly, the standby circuit uses Infineon parts.

Great Wall gathered vast experience over the years by cooperating with Corsair to produce SFX units, and this is why it is now the number one force in this market segment.

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3 thoughts on “Corsair SF850 ATX v3.1 PSU Review

  1. Hi, I have this PSU and it suffer to very loud coil whine when the GPU is used (benchmarks, gaming).
    Also sometimes I hear clicks from inside, for example when I run a benchmark.
    Do you think I should replace it?
    Thanks!

  2. 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)

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