Cooler Master V850i Gold PSU Review

Part Analysis

General Data
Manufacturer (OEM) Chicony Power
PCB Type Double-Sided
Primary Side
Transient Filter 4x Y caps, 2x X caps, 2x CM chokes, 1x MOV
Inrush Protection 1x NTC Thermistor JNR15S100L (10 Ohm) & Relay
Bridge Rectifier(s)
2x Diodes GBU15JL (600V, 15A @ 115°C)
2x Infineon IPP60R120P7 (600V, 16A @ 100°C, Rds(on): 0.120Ohm) &
1x Champion CM03X (reduce the no-load consumption)
APFC Boost Diode
1x CREE C6D10065A (650V, 10A @ 155°C)
Bulk Cap(s)
1x Rubycon (450V, 680uF, 3,000h @ 105°C, MXK)
Main Switchers
2x STMicroelectronics STF33N60M6 (600V, 15.8A @ 100°C, Rds(on): 0.125Ohm)
APFC Controller Infineon ICE2PCS01G
Resonant Controller MPS HR100A
Primary side: APFC, Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V MOSFETs ?
5V & 3.3V DC-DC Converters: 4x Alpha & Omega AON6144 (40V, 89A @ 100°C, Rds(on): 2.4mOhm)
PWM Controller(s): ANPEC APW7159C
Filtering Capacitors Electrolytic:
3x Nippon Chemi-Con (2-5,000h @ 105°C, KZE)
2x Nichicon (5-6,000h @ 105°C, HV)
1x Nichicon (2-4,000h @ 105°C, HD)
2x Rubycon (6-10,000h @ 105°C, ZLH)
Polymer: 11x Nippon Chemi-Con, 7x FPCAP, 10x NIC, 2x Nichicon
Supervisor IC Weltrend WT7502R
ARM Microcontroller Nuvoton M032EC1AE (USB connectivity & Monitoring)
Fan Model Snowfan YY14025M12B (140mm, 12V, 0.40A, Fluid Dynamic Bearing Fan)
5VSB Circuit
STMicroelectronics STD4N80K5 FET(800V, 1.7A @ 100°C, Rds(on): 2.5Ohm)
Advanced Power AP6N6R5LMT-L FET (60V, 16.9A @ 70°C, Rds(on): 6.5mOhm)
Standby PWM Controller OnSemiconductor NCP12400
-12V Circuit
UTC LM7912L (-12V, 1A)

The PCB is not overloaded with parts, and there is plenty of space between them for good airflow. The main transformer is small, using a unique design to cope with the unit’s max power, and the heatsinks are also small, especially on the secondary side. The build quality is high since Chicony’s production lines are good.

This unit is advertised as semi-digital but uses analog controllers for all its vital functions. It only provides monitoring functions through the Nuvoton M032EC1AE MCU that it uses. Interestingly, this MCU’s target apps are gaming mice, LED controllers, and coffee makers! I am sure that Nuvoton didn’t have PSU use in its targeted apps!

We meet a half-bridge topology and an LLC resonant converter on the primary side. On the secondary side, we find a synchronous rectification scheme and a pair of DC-DC converters to generate the minor rails. All parts are of high quality, and the electrolytic caps belong to respected Japanese manufacturers.

The cooling fan uses a fluid dynamic bearing, and it is from a brand that I never encountered so far. Although its model number implies a 140mm fan, it is a bit smaller, with a 135mm diameter.

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3 thoughts on “Cooler Master V850i Gold PSU Review

  1. Thanks Aris. Been waiting for this.

    Got this psu on prime day discounted w/ a $50 rebate based on your ATX 3.0 tier list. Was hesitant to jump the gun since there was no cybernetics report or in-depth reviews on the 850W at the time.

    Relieved to see your positive endorsement of the OEM. 😅

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