Skip to content

Corsair · 850 W · ATX

CORSAIR RM850x

ATX 3.1 · 80 PLUS Gold · Modular

Capability
77
Cap / price
55
Wattage value
49
Amazon
$140
CORSAIR RM850x
View CORSAIR RM850x Gallery in high resolution
$140
Available on Amazon Updated Aug 30, 2026
Capability77.2
Capability / price55.2
Wattage value48.6
$140 on Amazon PSU table Compare this PSU

Size this PSU for a complete buildThe Builder unlocks PSU choices after it knows the CPU, GPU, case format, and estimated demand. Calculate build power first

Written analysis

CORSAIR RM850x at a glance

The CORSAIR RM850x is a 850 W ATX power supply built to the ATX 3.1 generation. Efficiency is listed as 80 PLUS Gold. Cables are modular. It supports fan-stop at low load.

The calculated capability score is 77.2, averaging the available wattage, recorded efficiency percentage, and warranty inputs against fixed references. Listed warranty is 10 years. +12V output is 71 A.

Best fit: Performance desktops whose calculated component load fits comfortably within a 750–999 W supply.

Platform and cooling

Dimensions are listed as 160x150x86. Cooling fan size is 140 mm. The unit uses 1 +12V rail at up to 71.00 A per rail. Certifications include 80 PLUS Gold.

Current value

At $140, price per kilowatt is $164.69. Capability / price is 55.2 and wattage value is 48.6. Compare nearby supplies below; wattage alone does not determine value.

Unit data

Full specifications

Wattage, efficiency, platform size, electrical outputs, connectors, cooling, and value in one technical sheet.

General

Manufacturer
Corsair
PSU
CORSAIR RM850x
Launch price
—
Amazon price
$140
Amazon availability
Available
Price updated
Aug 30, 2026

Power & efficiency

Wattage
850 W
Efficiency
80 PLUS Gold
Recorded efficiency
91%
Warranty
10 years

Value

Amazon price
$140
Price / kW
$164.69
Capability
77.2
Capability / price
55.2
Wattage value
48.6

Platform & size

ATX generation
3.1
Form factor
ATX
Dimensions
160x150x86
Modular
Yes
Fanless
No

Electrical

Input voltage
100-240
+12V output
71 A
+5V output
20 A
+3.3V output
20 A
+12V rails
1
Max amps / rail
71.00 A

Cooling & build

Fan size
140 mm
Fan stop
Yes
Certifications
80 PLUS Gold

Additional information

Also listed as
RM850x
Color
Black
Note
Hi quality and good overall performance

Amazon

Price history

Nearby capability

Similar PSUs

Power supplies close to CORSAIR RM850x on calculated capability. Open the PSU table to sort, filter, and compare side by side.

Compare these in the PSU table

Discussion

Comments on CORSAIR RM850x

No comments yet.

Vendor copy

Amazon listing details

Marketplace feature text kept for reference. Structured specifications above are the source for scores and comparisons.

Fully Modular: Reliable and efficient low-noise power supply with fully modular cabling, so you only have to connect the cables your system needs.

Cybenetics Gold-Certified: Rated for up to 91% efficiency, resulting in lower power consumption, less noise, and cooler temperatures.

ATX 3.1 Compliant: Compliant with the ATX 3.1 power standard from Intel, supporting PCIe 5.1 and resisting transient power spikes.

Native 12V-2x6 Connector: Ensures compatibility with the latest graphics cards with a direct GPU to PSU connection – no adapter necessary.

Embossed Cables with Low-Profile Combs: Sleek, ultra-flexible embossed cables look great and make installing and connecting the RMx a breeze.

Privacy controls

Choose whether optional analytics may run. Necessary storage remains active because it supports security, login, requested preferences, and this choice.

Necessary Security, sessions, forms, and preferences you request.
Always active