Corsair RM850x Power Supply

Corsair RM850x

Brand
Corsair
Model
RM850x
$128–$142estimated range · from catalog price Aug 31, 2026

Corsair RM850x (2021) is a fully modular 850W 80+ Gold ATX PSU for high-end builds, with 10-year warranty and optional 12VHPWR cable but no native ATX 3.x.

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.
Released2021
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Wattage850 W
Efficiency80 + Gold
Form factorATX
ModularYes
GixCore Editorial

Product overview

Corsair’s RM850x is the 850 W model from the RMx (2021) refresh of the long‑running RMx family (SKU CP-9020200-NA), introduced in 2021. It’s a high_end‑tier PSU: 80+ Gold efficiency, fully modular cabling, and an ATX form factor for mainstream to high‑end desktop builds—meant to deliver dependable power without paying for newer ATX 3.x extras. At 850 W it fits single‑GPU high‑end rigs with some headroom, while fully modular Type‑4 cables aid clean assembly and upgrades; Corsair backs it with a 10‑year warranty. This 2021 revision is ATX12V v2.4 and ships without a native 12VHPWR lead, though Corsair offers a compatible 12VHPWR cable for RMx 2021 units. A notable touch is its 135 mm magnetic‑levitation fan.

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