Head-to-head · Best 850w Power Supplies

Corsair HX850 vs Corsair RM850e

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

Verdict is reader-supported. As an Amazon Associate we earn from qualifying purchases. Some links on this page are affiliate links — if you click through and buy, we may earn a small commission at no extra cost to you. Our ratings are sourced from independent publications, not sponsors.

The short answer

Corsair HX850 comes out ahead by a clear margin (4.6 vs 4.2). The gap is mostly about fit for purpose — read the strengths below before deciding.

Higher ratedRanked #2 in Best 850w Power Supplies

Corsair HX850

4.6

3 sources2 derived$311as of Aug 1

The Corsair HX850 is an 80 Plus Platinum, fully modular 850W unit whose defining trait is silence: ZeroRPM keeps the 135mm fan stopped until load demands it. KitGuru points to the Japanese 105°C capacitors and the build quality behind the ten-year warranty, and PC Perspective's bench work found voltage regulation on the main rails inside tight tolerances. The complaints are practical rather than electrical — thick ATX, EPS and PCIe cables that fight small cases, and over-current protection behaviour on the 5VSB rail. It suits a quiet high-end build where cable room is not the constraint.

Strengths

— Full power at 46°C ambient temperature
— 90% efficiency at real-world load conditions
— ZeroRPM mode for fanless operation at low loads

Watch-outs

— OCP at 5VSB
— Bulky ATX, EPS and PCIe cables

$311 · Buy at newegg.com Full review →

Ranked #4 in Best 850w Power Supplies

Corsair RM850e

4.2

3 sources1 derived$119as of Jul 31

The Corsair RM850e is an affordable ATX 3.0 unit that performs solidly, with efficiency and a fully modular layout in its favor. Tech4Gamers reviewer Arsalan Shakil credited it with 'impressive efficiency and acceptable voltage regulation' even with non-Japanese capacitors and no native 12VHPWR connector. KitGuru's Allan 'Zardon' Campbell praised the quiet rifle-bearing fan and the soldering quality, but listed the 7-year warranty among the unit's shortcomings. That missing 12VHPWR connector is the catch for anyone running a high-end graphics card.

Strengths

— High efficiency with 90% efficiency rating
— Fully modular cabling for clean builds
— 7-year warranty for peace of mind

Watch-outs

— No native 12VHPWR connector for latest GPUs
— Uses non-Japanese capacitors

$119 · Check Price on Amazon Full review →

Derived means the reviewer published no score, so one was inferred from their written verdict. Everything else is a number the publisher printed. How we rank.

Specs side-by-side

Spec	Corsair HX850	Corsair RM850e
Wattage	850W	850W
Efficiency	80 Plus Platinum	ATX 3.0
Form Factor	ATX	ATX Form Factor
Modularity	Fully Modular	Fully
Fan Size	135mm fluid dynamic bearing	120mm rifle bearing
Warranty	10 years	Seven-year
Compliance	ATX12V v2.4 and EPS 2.92 standards	80 PLUS Gold
Connectors	2x EPS, 6x PCIe 6+2 pin, 16 SATA, 1x FDD, 1x ATX	—

← See the full ranking of best 850w power supplies