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Head-to-head · Best 850w Power Supplies

Seasonic Focus PX-850 vs Thermaltake Toughpower GF3 850W

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 (4.9 vs 4.0). The gap is mostly about fit for purpose — read the strengths below before deciding.

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 →
Thermaltake Toughpower GF3 850W
Ranked #6 in Best 850w Power Supplies
Thermaltake Toughpower GF3 850W
3 sources$109.99as of Jul 31

The Thermaltake Toughpower GF3 850W carries 80 PLUS Gold and Cybenetics ETA Gold certification, ATX v3.0 and PCIe 5.0 compatibility, and a 12VHPWR connector rated at 450W. APH Networks called it a silent-to-very-quiet, fully modular unit built by CWT and cooled by a 135mm fluid dynamic bearing fan, and reported that Thermaltake’s advertised "100% Japanese brand capacitors" claim is false because the polymer capacitors are Chinese-made. Tom's Hardware called it one of the first ATX v3.0 PSUs with decent performance and quiet operation, but measured short peak efficiency and high inrush current at 230V. It fits buyers who want dependable v3.0 compatibility and a 10-year warranty, not those chasing the absolute best in performance or fan quality.

Strengths
  • — ATX v3.0 and PCIe 5.0 compatible with 12VHPWR connector rated at 450W
  • — Fully modular design with 135mm fluid dynamic bearing fan for quiet operation
  • — Semi-passive operation available and selectable
Watch-outs
  • — Advertised "100% Japanese" capacitors: the polymer capacitors are Chinese-made
  • — Average transient response at 12V rail
  • — High inrush current with 230V input
$109.99 · Check Price on AmazonFull review →

Specs side-by-side

SpecSeasonic Focus PX-850Thermaltake Toughpower GF3 850W
Wattage850W850W
Efficiency80+ Platinum80 PLUS Gold, Cybenetics Gold (87-89%)
Form FactorIntel ATX 12 VATX
ModularityFully ModularFully modular
Fan Size120mm FDB135mm Fluid Dynamic Bearing Fan (HA13525H12SF-Z)
Warranty10 Years10 years
ComplianceEnergy Star, RoHS, WEEE, ErP Lot 6, REACHATX v3.0, EPS 2.92
Connectors20+4Pin, 2 x 4/8 Pin CPU, 6 x 6+2 pin PCIe, 10 x SATAPCIe 6+2Pin X 4, PCIe 12+4Pin X 1
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