Corsair RMX White Series (2018), RM850x

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.

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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.

Tierhigh_endReleased2018-08-16
Best for
  • mid-range gaming
  • high-end GPU builds
  • headroom/overclocking
Official product specifications

Product highlights

  • 80+ gold Certified high efficiency operation for lower power consumption less noise and cooler temperatures
  • Tuned for Low noise operation a specially set fan curve ensures that even at full load fan noise is kept to a minimum
  • Zero rpm fan mode at Low and medium loads the cooling fan switches off entirely for near-silent operation
  • 100% all Japanese capacitors premium internal components ensure unwavering power delivery and long-term reliability
  • Fully modular flat cables flexible fully modular flat White cables for Easy cable routing

Specifications

Wattage
850 W
Efficiency
80+ Gold
Modular
Yes
Eco Mode
No
Form factor
ATX

Compatible Motherboards

Compatible Cases