Corsair
Corsair RMX RM850x 850W
A solid mid-range power supplie for PC builders, leading with 850 W.
59/100
850 WGoldFully modular10 yearsBlack
£328best price at Amazon
In stock at 1 retailer
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Why we rate it
- Zero RPM mode
- All-Japanese capacitors
- Above-average warranty
- No 12v-2x6 / 12vhpwr
- Below-average wattage
Score profile
Scored against the power supplies classWhere the Corsair RMX RM850x 850W wins and loses
Full specification
Grouped · supported features marked in blueSpecifications
Output
Wattage850 W
Efficiency ratingGold
Form factor and design
ModularFully modular
Weight1.66 kg
ColourBlack
Cooling and noise
Zero RPM modeYes
Features and warranty
All-Japanese capacitorsYes
Warranty10 years
Watch it in action
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Head to head
Highlighted cell = better in that rowCorsair RMX RM850x 850W vs Gigabyte Gigabyte UD850GM PG5 ICE 850W
Corsair RMX RM850x 850WGigabyte UD850GM PG5 ICE 850W
| CorsairCorsair RMX RM850x 850WThis page | GigabyteGigabyte UD850GM PG5 ICE 850W | |
|---|---|---|
| Overall score | 59 /100 | 60 /100Better |
| Wattage | 850 W | 850 W |
| Efficiency rating | Gold | 80 |
| Form factor | — | ATX |
| Modular | Fully modular | Fully modular |
| Warranty | 10 years | 10 years |
Who it's for
Is the Corsair RMX RM850x 850W 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.
good
Mainstream builder
Wants strong value in a balanced build.
good
Budget builder
Stretching every pound in an entry rig.
good
Common questions
Before you buy
Is the Corsair RMX RM850x 850W worth it?
It depends on what you need. It scores 59/100 against other power supplies, a solid mid-range result where the class average is around 58.
What stands out on the Corsair RMX RM850x 850W?
Its zero rpm mode stands out, a genuinely useful feature if your setup calls for it.
How does it compare to the Gigabyte UD850GM PG5 ICE 850W?
The Gigabyte UD850GM PG5 ICE 850W scores 60/100 versus this one at 59/100, so it is the step up on the spec sheet.
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