Head-to-head · Best 850w Power Supplies

Corsair HX850 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.

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The short answer

Corsair HX850 comes out ahead by a clear margin (4.6 vs 3.5). 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 #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 HX850	Seasonic Focus GX-850
Wattage	850W	850W
Efficiency	80 Plus Platinum	80 PLUS Gold (up to 92%)
Form Factor	ATX	ATX Form Factor
Modularity	Fully Modular	Full Modular
Fan Size	135mm fluid dynamic bearing	135mm FDB fan with 3 modes
Warranty	10 years	10-year limited
Compliance	ATX12V v2.4 and EPS 2.92 standards	Energy Star, RoHS, WEEE, ErP Lot 6, REACH
Connectors	2x EPS, 6x PCIe 6+2 pin, 16 SATA, 1x FDD, 1x ATX	3x 6+2 pin PCIe, 1x 12+4 pin PCIe

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