Corsair SF850L SFX-L PSU Review – The BEST SFX-L PSU

Part Analysis

General Data
Manufacturer (OEM) Great Wall
PCB Type Double-Sided
Primary Side
Transient Filter 4x Y caps, 2x X caps, 3x CM chokes, 1x MOV
Inrush Protection 1x NTC Thermistor SCK-056 (5 Ohm) & Relay
Bridge Rectifier(s)
2x Shindengen US30KB80R (800V, 30A @ 97°C)
2x Infineon IPW60R060C7 (600V, 22A @ 100°C, Rds(on): 0.06Ohm)
APFC Boost Diode
1x Cree C3D16065A (650V, 16A @ 142°C)
Bulk Cap(s)
2x Rubycon (420V, 510uF & 330uF each or 840uF combined, 3,000h @ 105°C, MXK)
Main Switchers
2x ON Semiconductor FCP104N60F (600V, 24A @ 100°C, Rds(on): 0.104Ohm)
Driver IC 1x Novosense NSi6602BD
APFC Controller Champion CM6502UHHX & CM03AX
Resonant Controller Champion CM6901X
Primary side: APFC, Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V MOSFETs 8x Vishay SiR608DP (45V, 166A @ 70°C, Rds(on): 1.8mOhm)
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), 2x Rubycon (4-10,000h @ 105°C, YXF)
Polymer: 9x NIC, 3x United Chemi-Con, 20x FPCAP, 4x Nichicon
Supervisor IC IN1S429I-SCG (OCP, OVP, UVP, SCP, PG)
Fan Controller Microchip PIC16F1824
Fan Model Corsair NR1215 (120mm, 12V, 0.55A, Fluid Dynamic Bearing Fan)
5VSB Circuit
1x Infineon ICE5QR1680AG (800V, 5.8A, Rds(on): 1.75Ohm) &
1x Texas Instruments
CSD18534Q5A FET (60V, 13A, Rds(on): 9.8Ohm)
Standby PWM Controller Infineon ICE5QR1680AG

Despite the small PCB, there is enough space on the secondary side to allow for good airflow. When there is enough distance between parts, airflow is better, and the heat can be transferred easily from the PSU’s internals. The installation of both VRMs, generating the minor rails, on a daughter board helped in this. The primary side’s heatsink is large enough to host all parts that require strong cooling to cope with high loads. The pair of bulk caps is necessary to provide a long hold-up time because there is no space for a single, huge one.

The soldering quality is good, and on the solder side of the PCB, we find the eight FETs regulating the 12V rail. The 120mm cooling fan is the same one used in the SF1000L, and it uses a fluid dynamic bearing and is pretty strong, with 0.55A max current input.

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6 thoughts on “Corsair SF850L SFX-L PSU Review – The BEST SFX-L PSU

  1. Is the included 12VHPWR cable sufficient/safe for powering an RTX 4090 FE or should a 3×8 cable/adapter still be used? If it is sufficient and totally safe, does the manual specify which ports to use or doesn’t that matter?

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