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.

The short answer

Corsair HX850 comes out ahead by a clear margin (4.6 vs 4.1). 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

Buy at ebay.com 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 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
Connectors	2x EPS, 6x PCIe 6+2 pin, 16 SATA, 1x FDD, 1x ATX	3x 6+2 pin PCIe, 1x 12+4 pin PCIe

← See the full ranking of best 850w power supplies