Head-to-head · Best 850w Power Supplies

Corsair RM850x 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

Corsair RM850x comes out ahead by a clear margin (4.5 vs 4.2). Corsair RM850x is best for: Enthusiasts seeking long-term reliability and quiet operation. Read the strengths below before deciding.

Higher ratedRanked #1 in Best 850w Power Supplies

Corsair RM850x

4.5

3 sources$139.99as of Oct 21

The Corsair RM850x is a high-efficiency, fully modular power supply that meets ATX 3.1 standards with support for PCIe Gen 5 and transient spike resistance. It features a 140mm fluid dynamic bearing fan with adjustable speed control, low noise operation, and a 10-year warranty. The unit includes fully modular cabling with dedicated PCIe and EPS connectors, and it delivers steady power with 90% efficiency. While praised for its build quality and noise performance, some users noted the short distances between peripheral connectors could complicate cable management.

Strengths

— Fully modular design with high-quality cables and dedicated connectors
— 10-year warranty support
— Low noise operation with fluid dynamic bearing fan and zero RPM mode, per KitGuru

Watch-outs

— Fan speed control knob requires manual adjustment under light loads

$139.99 · Check Price on Amazon Full review →

Ranked #4 in Best 850w Power Supplies

Thermaltake Toughpower GF3 850W

4.2

1 source$123.99as of Oct 11

The Thermaltake Toughpower GF A3 850W is a high-end PSU with Platinum efficiency certification and full ATX v3.0/PCIe 5.0 compatibility. It features a 160mm depth design, fully modular cabling, and semi-passive operation. It offers excellent efficiency and a decade-long warranty, and Tom's Hardware lists a 135mm fluid dynamic bearing fan.

Strengths

— Platinum certified efficiency rating of 89-91% at 115V
— 10-year warranty coverage, per Tom's Hardware
— Supports ATX v3.0 and PCIe 5.0 standards with 12VHPWR connector

Watch-outs

— Fan becomes more noticeable at around 70% load

$123.99 · Check Price on Amazon Full review →

How they stack up

Corsair RM850x

The Corsair RM850x stands out with its 10-year warranty and fluid dynamic bearing fan, offering superior noise control compared to the EVGA SuperNOVA 850 G7 which lacks this premium fan technology. Unlike the Seasonic Focus GX-850, it provides better PCIe 5.0 support and a more robust build quality, though it shares similar modular design with the Corsair RM850e.

Thermaltake Toughpower GF3 850W

The Thermaltake Toughpower GF3 850W offers Platinum efficiency and a 10-year warranty, and, like the Corsair RM850x and EVGA SuperNOVA 850 G7, it uses a fluid dynamic bearing fan (135mm, per Tom's Hardware). It's less efficient than the be quiet! Dark Power Pro 12 850W and lacks the premium features of the ASUS ROG Strix 850G Aura.

Specs side-by-side

Spec	Corsair RM850x	Thermaltake Toughpower GF3 850W
Wattage	850W	850W
Efficiency	90% (Cybenetics Gold Certified)	Platinum (89-91%)
Modularity	Fully Modular	Fully modular
Form Factor	ATX 3.1	ATX 3.1
Fan Type	140mm FDB	135mm Fluid Dynamic Bearing
Warranty	10 years	10 years
Dimensions	150 mm x 85 mm x 160 mm	150mm(W) x 86mm(H) x 160mm(D)
Connectors	11 modular sockets including 1x 12V-26	PCIe 6+2Pin X 4, PCIe 12+4Pin X 1

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