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.

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 RM850e comes out ahead by a clear margin (4.2 vs 3.5). The gap is mostly about fit for purpose — read the strengths below before deciding.

Higher ratedRanked #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 →

Ranked #7 in Best 850w Power Supplies

Seasonic Focus GX-850

3.5

2 sources1 derived$159.99as of Jul 31

The Seasonic Focus GX-850 V4 holds full power at 46°C and is ready for ATX v3.1 and PCIe 5.1, with high build quality and good ripple suppression. Overall performance is where it falls short, and the fan speed profile needs work. TechPowerUp and Hardware Busters both criticized its transient response and its efficiency under light loads. One user on Facebook reported returning multiple PSUs before settling on this model. It suits buyers who weigh build quality and features above 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

$159.99 · 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 RM850e	Seasonic Focus GX-850
Wattage	850W	850W
Efficiency	ATX 3.0	80 PLUS Gold (up to 92%)
Modularity	Fully	Full Modular
Fan Size	120mm rifle bearing	135mm FDB fan with 3 modes
Form Factor	ATX Form Factor	ATX Form Factor
Warranty	Seven-year	10-year limited
Compliance	80 PLUS Gold	Energy Star, RoHS, WEEE, ErP Lot 6, REACH
Connectors	—	3x 6+2 pin PCIe, 1x 12+4 pin PCIe

← See the full ranking of best 850w power supplies