Corsair HX850 (2017)

Corsair’s HX850 belongs to the 2017 HX Series (Platinum) introduced at CES on January 5, 2017; this 850 W ATX, fully modular unit pairs an 80 PLUS Platinum rating with a 135 mm fluid-dynamic-bearing fan and a 10‑year warranty. Regional retail rollouts followed through 2017.

Positioned in the enthusiast tier, it exists to provide quiet, efficient, long‑lived power for demanding ATX builds. It’s well suited to high-end GPU builds, overclocked CPUs, and mid‑range gaming systems that want headroom and low noise without moving to a kilowatt class. Notable: it includes a hardware switch to toggle single‑ or multi‑rail +12 V operation. It predates ATX 3.0 and lacks a native 12VHPWR lead, so PCIe 5.0 GPUs require an adapter or compatible cable.