Corsair RMx Series 850 W (2021) Review 35

Corsair RMx Series 850 W (2021) Review

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We would like to thank Corsair for supplying the review sample.

After almost three years in production, Corsair decided to update its popular RMx line. There are again five members with capacities ranging from 550 W to 1000 W. All are fully modular, and the OEM is still Channel Well Technology. Listed below are the crucial changes over the RMx 2018 units with the RMx 2021 revision:
  • Magnetic levitation fan for increased lifetime under high operating temperatures
  • Modern standby compatibility for fast wake from sleep times
  • High efficiency under very light and light loads
  • Three EPS connectors with the 1000 W and 850 W units
  • Cybenetics and 80 PLUS (in the reviewer's guide) certifications
This is the first time I see an ML fan in a power supply. This is excellent news because this bearing has the great endurance of double ball-bearings under high operating temperatures and the low noise output of a fluid dynamic bearing. The only downside is the higher cost. Another first for the new RMx is the number of EPS connectors. Who will ever need three of these connectors? This is too much power for nothing but the CPU socket area. Corsair must know something we aren't privy to. Utilizing three EPS connectors fully would need the CPU to draw 1 kW!

The Corsair RM850x is the second-strongest member of the line, suitable for strong gaming systems since it can support all high-end AMD and Intel CPUs along with such power-hungry cards as the RTX 3080, RTX 3090, RX 6800 XT, and RX 6900 XT. If you plan to overclock a system with similar specifications considerably, you are better off with the RM1000x.


Corsair RM850x
Features & Specifications
Max. DC Output850 W
Efficiency (230V)80 PLUS Gold, Cybenetics Gold (89%–91%)
Noise (230V)Cybenetics Standard++ (30–35 dBA)
ModularYes (fully)
Intel C6/C7 Power State SupportYes
Operating Temperature0–50 °C
ProtectionsOver Voltage Protection
Under Voltage Protection
Over Power Protection
Over Temperature Protection
Over Current Protection
Short Circuit Protection
Cooling140 mm magnetic levitation fan (NR140ML)
Semi-passive OperationYes
Dimensions (W x H x D)150 x 85 x 160 mm
Weight1.71 kg (3.77 lb)
ComplianceATX12V v2.53, EPS 2.92
Warranty10 years
Price at Time of Review (excl. VAT)$149.99
Corsair RM850x
Power Specifications
Rail3.3 V5 V12 V5 VSB-12 V
Max. Power20 A20 A70.8 A3 A0.3 A
150 W849.6 W15 W3.6 W
Total Max. Power850 W
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Jun 29th, 2022 09:33 EDT change timezone

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