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Head-to-head · Best 850w Power Supplies

Corsair RM850e 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.

The short answer

Corsair RM850e comes out ahead by a clear margin (4.4 vs 4.1). The gap is mostly about fit for purpose — read the strengths below before deciding.

Corsair RM850e
Higher ratedRanked #2 in Best 850w Power Supplies
Corsair RM850e
$109.99as of Jul 8

The Corsair RM850e delivers solid performance as an affordable ATX 3.0 PSU, earning praise for its efficiency and fully modular design. Tech4Gamers reviewer Sameed Hussain noted it offers 'impressive efficiency and acceptable voltage regulation' despite using non-Japanese capacitors and lacking a native 12VHPWR connector. KitGuru's Allan 'Zardon' Campbell highlighted its 7-year warranty and low-noise operation with a rifle-bearing fan. While it's a budget-friendly option, the lack of a native 12VHPWR connector may disappoint users with high-end graphics cards.

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
$109.99 · Check Price on AmazonFull review →
Seasonic Focus PX-850
Ranked #7 in Best 850w Power Supplies
Seasonic Focus PX-850
$345as of Jul 8

The Seasonic Focus PX-850 is a high-quality 850W Platinum power supply that delivers excellent efficiency and reliability. Reviewers praised its fully modular design, high-grade Japanese capacitors, and Fluid Dynamic Bearing fan with customizable cooling modes. The unit offers a single +12V rail capable of 70A and comes with a 10-year warranty, setting it apart from competitors. While it's priced competitively at around $140, it remains more expensive than some budget alternatives. This PSU is ideal for enthusiasts and professionals seeking premium build quality and long-term reliability, though budget-conscious users might find better value elsewhere.

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 some budget alternatives despite being $20-$40 cheaper than competitors
  • — Small 140mm footprint may not fit all cases with tight space constraints
$345 · Check Price on AmazonFull review →

Specs side-by-side

SpecCorsair RM850eSeasonic Focus PX-850
Wattage850W850W
EfficiencyATX 3.080+ Platinum
Form FactorATX Form FactorIntel ATX 12 V
ModularityFullyFully Modular
Fan Size120mm rifle bearing120mm FDB
WarrantySeven-year10 Years
Connectors1x ATX 24-pin, 2x EPS 8-pin, 1x 12V-2x6, 2x PCIe 6+2 pin, 4x SATA, 4x PATA20+4Pin, 2 x 4/8 Pin CPU, 6 x 6+2 pin PCIe, 10 x SATA
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