Corsair
Corsair RM850 (2021)
The Corsair RM850 (2021) lands as a solid mid-range power supplie, built around 850 W.
57/100
850 W80 Plus GoldFully modularATXWhiteRifle bearing
£130best price at Amazon
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Why we rate it
- Zero RPM mode
- Above-average fan size
- No 12v-2x6 / 12vhpwr
- Below-average wattage
Score profile
Scored against the power supplies classWhere the Corsair RM850 (2021) wins and loses
Full specification
Grouped · supported features marked in blueSpecifications
Output
Wattage850 W
Efficiency rating80
ATX standardATX
Form factor and design
Form factorATX
ModularFully modular
Weight1.65 kg
ColourWhite
Cooling and noise
Fan size140 mm
Fan bearingRifle bearing
Fan count1
Zero RPM modeYes
Watch it in action
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Head to head
Highlighted cell = better in that rowCorsair RM850 (2021) vs SAMA SAMA G850
Corsair RM850 (2021)SAMA G850
| CorsairCorsair RM850 (2021)This page | SAMASAMA G850 | |
|---|---|---|
| Overall score | 57 /100Better | 51 /100 |
| Wattage | 850 W | 850 W |
| Efficiency rating | 80 | 80 |
| Form factor | ATX | — |
| Modular | Fully modular | Fully modular |
Who it's for
Is the Corsair RM850 (2021) right for you?
Buy it if
Buyers on a budget
Anyone who needs a dependable power supplie for the essentials without overspending.
Skip it if
Skip it if
You need 12v-2x6 / 12vhpwr, in which case a higher-tier power supplie is the better call.
Performance builder
Chasing frames and headroom in a high-end rig.
okay
Mainstream builder
Wants strong value in a balanced build.
good
Budget builder
Stretching every pound in an entry rig.
excellent
Common questions
Before you buy
Is the Corsair RM850 (2021) worth it?
It depends on what you need. It scores 57/100 against other power supplies, a solid mid-range result where the class average is around 58.
What stands out on the Corsair RM850 (2021)?
Its zero rpm mode stands out, a genuinely useful feature if your setup calls for it.
How does it compare to the Corsair RM850e (2025)?
The Corsair RM850e (2025) scores 58/100 versus this one at 57/100, so it is the step up on the spec sheet.
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