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.

The short answer

Corsair HX850 comes out ahead by a narrow margin (4.6 vs 4.4). The gap is mostly about fit for purpose — read the strengths below before deciding.

Higher ratedRanked #1 in Best 850w Power Supplies

Corsair HX850

4.6

The Corsair HX850 is a high-performance power supply that delivers excellent efficiency and silent operation, particularly at low loads thanks to its ZeroRPM mode. Tom's Hardware praised its ability to maintain full power at 46°C and noted its superior noise reduction compared to competitors like the EVGA 850 G3 and Seasonic FOCUS PLUS. KitGuru highlighted its 80 Plus Platinum certification, fully modular design, and robust build quality. However, reviewers noted some drawbacks including OCP issues at 5VSB and bulky cable configurations. This PSU is ideal for enthusiasts seeking reliable, quiet power delivery but may not suit users prioritizing minimal cable clutter.

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

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Ranked #2 in Best 850w Power Supplies

Corsair RM850e

4.4

$109.99as of Jul 8

The Corsair RM850e delivers solid performance as an affordable ATX 3.0 PSU, earning praise for its efficiency and fully modular design. Tech4Gamers reviewer Sameed Hussain noted it offers 'impressive efficiency and acceptable voltage regulation' despite using non-Japanese capacitors and lacking a native 12VHPWR connector. KitGuru's Allan 'Zardon' Campbell highlighted its 7-year warranty and low-noise operation with a rifle-bearing fan. While it's a budget-friendly option, the lack of a native 12VHPWR connector may disappoint users with high-end graphics cards.

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

$109.99 · Check Price on Amazon Full review →

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
Connectors	2x EPS, 6x PCIe 6+2 pin, 16 SATA, 1x FDD, 1x ATX	1x ATX 24-pin, 2x EPS 8-pin, 1x 12V-2x6, 2x PCIe 6+2 pin, 4x SATA, 4x PATA

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