Head-to-head · Best 850w Power Supplies

Corsair RM850e vs Seasonic Focus GX-850

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 RM850e comes out ahead by a clear margin (4.4 vs 4.1). The gap is mostly about fit for purpose — read the strengths below before deciding.

Higher ratedRanked #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 →

Ranked #6 in Best 850w Power Supplies

Seasonic Focus GX-850

4.1

The Seasonic Focus GX-850 V4 delivers full power at 46°C and is ATX v3.1 and PCIe 5.1 ready with high build quality and good ripple suppression. However, reviewers noted it lacks competitive overall performance and has a fan speed profile that needs improvement. TechPowerUp and Hardware Busters both criticized its transient response and efficiency under light loads, while one user on Facebook mentioned returning multiple PSUs before settling on this model. It's best suited for users prioritizing build quality and features over peak performance.

Strengths

— Delivered full power at 46°C ATX v3.1 and PCIe 5.1 ready
— High build quality with OptiSink technology for better heat dissipation
— Good ripple suppression

Watch-outs

— Increased MSRP
— Not competitive overall performance
— Fan speed profile needs improvement

Check Price on Amazon Full review →

Specs side-by-side

Spec	Corsair RM850e	Seasonic Focus GX-850
Wattage	850W	850W
Efficiency	ATX 3.0	80 PLUS Gold (up to 92%)
Form Factor	ATX Form Factor	ATX Form Factor
Modularity	Fully	Full Modular
Fan Size	120mm rifle bearing	135mm FDB fan with 3 modes
Warranty	Seven-year	10-year limited
Connectors	1x ATX 24-pin, 2x EPS 8-pin, 1x 12V-2x6, 2x PCIe 6+2 pin, 4x SATA, 4x PATA	3x 6+2 pin PCIe, 1x 12+4 pin PCIe

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