Head-to-head · Best 850w Power Supplies

Corsair RM850e vs Corsair RM850x

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 (3.8 vs 4.4). The gap is mostly about Enthusiasts seeking long-term reliability and quiet operation — read the strengths below before deciding.

Ranked #7 in Best 850w Power Supplies

Corsair RM850e

3.8

4 sources2 derived$115.99as of Sep 15

The Corsair RM850e delivers reliable performance as part of Corsair's new RM series, offering fully modular cabling and native 12V-26 connectors for modern GPU support. Reviewers noted its efficient Cybenetics Gold-Certified design and quiet operation with zero RPM fan mode. While it provides solid power delivery and build quality, it trails competitors in warranty length and offers only a modest price increase over the 750W model. This PSU suits enthusiasts seeking a balance of efficiency and reliability without the premium warranty of flagship models.

Strengths

— Fully modular cabling allows for clean and customizable builds
— Native 12V-26 connector supports latest high-end graphics cards without adapters
— Efficient Cybenetics Gold-Certified design delivers up to 90% efficiency

Watch-outs

— 7-year warranty falls short of leading competitors' 12-year warranties
— Moderate price premium over the 750W model with only 100W more power

$115.99 · Check Price on Amazon Full review →

Higher ratedRanked #2 in Best 850w Power Supplies

Corsair RM850x

4.4

4 sources1 derived$139.99as of Sep 15

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

Watch-outs

— Fan speed control knob requires manual adjustment under light loads
— Short distances between peripheral connectors may cause cable management issues

$139.99 · Check Price on Amazon Full 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.

How they stack up

Corsair RM850e

The Corsair RM850e offers a more affordable entry point into the RM series compared to the RM850x, but lacks the 10-year warranty and fluid dynamic bearing fan. It's less efficient than the EVGA SuperNOVA 850 G7 and doesn't match the premium build quality of the be quiet! Dark Power Pro 12 850W, though it does provide native 12V-26 support like the latter.

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.

Specs side-by-side

Spec	Corsair RM850e	Corsair RM850x
Wattage	850W	850W
Efficiency	80 Plus Gold (up to 90%)	90% (Cybenetics Gold Certified)
Modularity	Full Modular	Fully Modular
Fan Type	120mm rifle bearing with zero RPM mode	140mm FDB
Warranty	7 years	10 years
Connectors	Fully modular with 12V-26	11 modular sockets including 1x 12V-26
Dimensions	140 x 150 x 86 mm	150 mm x 85 mm x 160 mm
Form Factor	ATX 3.1	ATX 3.1

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