Corsair RMX White Series (2018), RM850x Power Supply

Corsair RMX White Series (2018), RM850x

Brand
Corsair
Model
RMX White Series (2018), RM850x
UPC
843591075701
$247–$273estimated range · from catalog price Sep 3, 2026

Corsair RM850x White (2018): 850W 80+ Gold fully modular ATX PSU for quiet mid‑range to high‑end builds; pre‑ATX 3.0 with no native 12VHPWR.

TierHigh end?GixCore tierWhat a part was built to do — not what it costs.EntryBudgetMainstreamHigh endEnthusiastFlagship A part can be cheap because it is an ageing flagship, or because it is a current entry-level model. The tier tells you which.
ReleasedAug 2018
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Wattage850 W
Efficiency80+ Gold
Form factorATX
ModularYes
GixCore Editorial

Product overview

Released on August 16, 2018, the Corsair RMx White Series (2018) RM850x is a white-finished member of Corsair’s RMx (2018) refresh. It’s an 80 PLUS Gold, fully modular ATX unit with a 10‑year warranty and ATX12V v2.4/EPS 2.92 compliance.

Positioned as high_end for its class, it exists to provide a quiet, reliable 850 W option for clean-looking builds. It suits mid‑range gaming through many high‑end GPU builds that use 8‑pin PCIe power, offers headroom for powerful CPUs via dual EPS, and features a zero‑RPM fan mode for low‑noise operation. Being pre‑ATX 3.0, it lacks a native 12VHPWR lead and is best paired with GPUs that don’t require it or with adapters. Notable: compact 160 mm depth helps in tighter ATX cases.

Best for
  • mid-range gaming
  • high-end GPU builds
  • headroom/overclocking
Official product specifications

Specifications

At a glance iEach dot represents a catalog model. Farther right means a higher measured value, not necessarily a better fit.Measured against the power supplies catalog
Current modelCatalog models
Wattage850 W
Higher than 73% of power supplies
Wattage
850 W
Efficiency
80+ Gold
Modular
Yes
Eco Mode
No
Form factor
ATX
Pairing fit

Compatible Motherboards

Compatible options ranked for this part's performance class.

Budget pairings6 lower-tier compatible options
Pairing fit

Compatible Cases

Compatible options ranked for this part's performance class.

Budget pairings6 lower-tier compatible options