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Head-to-head · Best 850w Power Supplies

Seasonic Focus GX-850 vs Seasonic Focus PX-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

Seasonic Focus PX-850 comes out ahead by a clear margin (3.5 vs 4.9). The gap is mostly about fit for purpose — read the strengths below before deciding.

Seasonic Focus GX-850
Ranked #7 in Best 850w Power Supplies
Seasonic Focus GX-850
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 AmazonFull review →
Seasonic Focus PX-850
Higher ratedRanked #1 in Best 850w Power Supplies
Seasonic Focus PX-850
3 sources$413as of Aug 1

The Seasonic Focus PX-850 is a Platinum-rated 850W unit that runs efficiently and holds up over time. RelaxedTech praised the fully modular design, the high-grade Japanese capacitors, and the Fluid Dynamic Bearing fan with customizable cooling modes. A single +12V rail handles 70A, and the 10-year warranty puts it ahead of most competitors. At around $140 the price is competitive but still above budget alternatives. Enthusiasts and professionals who want premium build quality and long-term reliability should buy; budget-conscious users can find better value.

Strengths
  • — 80+ Platinum efficiency rating with 92% efficiency at 50% load
  • — Fully modular design with flat black cables for improved airflow
  • — Fluid Dynamic Bearing (FDB) fan with three operational stages: Fanless, Silent, and Cooling Mode
Watch-outs
  • — Price is still higher than budget Gold-class alternatives, even though it undercuts rival Platinum units by $20-$40
  • — Small 140mm footprint may not fit all cases with tight space constraints
$413 · Buy at newegg.caFull 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

SpecSeasonic Focus GX-850Seasonic Focus PX-850
Wattage850W850W
Efficiency80 PLUS Gold (up to 92%)80+ Platinum
Form FactorATX Form FactorIntel ATX 12 V
ModularityFull ModularFully Modular
Fan Size135mm FDB fan with 3 modes120mm FDB
Warranty10-year limited10 Years
ComplianceEnergy Star, RoHS, WEEE, ErP Lot 6, REACHEnergy Star, RoHS, WEEE, ErP Lot 6, REACH
Connectors3x 6+2 pin PCIe, 1x 12+4 pin PCIe20+4Pin, 2 x 4/8 Pin CPU, 6 x 6+2 pin PCIe, 10 x SATA
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