Skip to content
Magic Prices: Price Comparison
Best Deals

Corsair RM850x power supply unit 850 W 24-pin ATX ATX Black

Corsair RM850x, 850 W, 100 - 240 V, 47 - 63 Hz, 5 - 10 A, 150 W, 849.6 W

Best offerPrice trend

£142.92

-11%
Price trend
Detailed analysis
Price history of Corsair RM850x power supply unit 850 W 24-pin ATX ATX Black over the last 3 months
DatePrice
11 April 2026£160.28
11 April 2026£139.62
18 April 2026£141.38
25 April 2026£142.92
3 May 2026£160.28
3 May 2026£142.92
11 May 2026£160.28
11 May 2026£142.92
19 May 2026£160.28
19 May 2026£142.92
27 May 2026£160.28
27 May 2026£142.92
4 June 2026£160.28
4 June 2026£142.92
13 June 2026£160.28
13 June 2026£142.92
21 June 2026£160.28
21 June 2026£142.92
30 June 2026£160.28
30 June 2026£142.92
Offres:

Compare Corsair RM850x power supply unit 850 W 24-pin ATX ATX Black prices UK

*Date of last price update

User Notice: We regularly reference new offers to provide you with the widest selection. However, the displayed results do not reflect all available offers on the market. By default, offers are sorted by price, with the lowest price appearing first.

Product Information

MAGNETIC LEVITATION COOLING MEETS HIGH EFFICIENCY
CORSAIR RMx Series fully modular power supplies are built with the highest quality components to deliver 80 PLUS Gold efficient power to your PC with the cooling power of potent Magnetic Levitation fans.

135MM MAGNETIC LEVITATION FAN
Utilizes a magnetic levitation bearing and custom engineered rotors for high performance, low bearing noise, and superior reliability.

HIGH EFFICIENCY
With upwards of 90% peak efficiency, RMx produces less noise and less heat, which means less time worrying and more time gaming.

FULLY MODULAR WITH MULTIPLE EPS12V CONNECTORS
Completely modular cables means you only connect the cables your system needs, and the wide range of included cables adds broad compatibility with modern graphics cards and motherboards.

Also compatible with the 12-pin GPU Power Cable for the hottest new GPUs.

ZERO RPM FAN MODE
At low and medium loads the cooling fan switches off entirely for near-silent operation, but once the action picks up, the fan activates, ensuring critical component temps stay in check.

TECHNOLOGY AND RELIABILITY
For consistent, reliable power and superb electrical performance, each RMx Series power supply features a robust resonant LLC topology with DC-DC conversion, and 105°C rated 100% Japanese capacitors. With precise timings, RMx supports Microsoft Modern Standby, ensuring extremely fast wake-from-sleep times and better low-load efficiency.

CERTIFICATIONS
The Cybenetics organization measures efficiency and noise levels across the PSU’s entire operational range, using more than 1,450 different load combinations.

The "Gold" efficiency rating is defined as ≥87% to <91% (depending on input voltage).

The "A-" noise level test is measured in those same configurations to be ≥25 dBA & <30 dBA under noise data averaging.

YOUR BUILD, YOUR WAY
Every fully modular CORSAIR PSU is compatible with a wide range of CORSAIR accessories. From individually sleeved cables in a variety of color combinations to 12-pin micro-fit GPU cables and 12VO motherboard cables, complete your build your way.

Power Supply Units Corsair

Product

Name
Corsair RM850x power supply unit 850 W 24-pin ATX ATX Black
Brand
Corsair

Power

Total power
850 W
AC input voltage
100 - 240 V
AC input frequency
47 - 63 Hz
Input current
5 - 10 A
Combined power (+3.3V)
150 W
Combined power (+12V)
849.6 W
Combined power (+5V)
150 W
Combined power (-12V)
3.6 W
Combined power (+5Vsb)
15 W
Max output current (+3.3V)
20 A
Max output current (+12V)
70.8 A
Max output current (+5V)
20 A
Max output current (-12V)
0.3 A
Max output current (+5Vsb)
3 A
Efficiency
90%

Weight & dimensions

Width
150 mm
Depth
160 mm
Height
86 mm
Weight
1.7 kg

Ports & interfaces

Motherboard power connector
24-pin ATX
Peripheral (Molex) power connectors (4-pin)
1
Motherboard power cable length
61 cm
Number of SATA power connectors
4
SATA power cable length
750,850 mm
Peripheral (Molex) power cable length
750 mm
EPS power connector (4+4 pin)
Yes
PCI Express power connectors (6+2 pin)
2
CPU power connector (4+4 pin)
Yes
CPU power cable length
65 cm
ATX Power connector (24-pin)
Yes
Cabling type
Fully-Modular

Performance

Purpose
PC
Power supply unit (PSU) form factor
ATX
80 PLUS certification
80 PLUS Gold
Noise level
35 dB

Design

Product colour
Black
Cooling type
Active
Fan diameter
13.5 cm
Number of fans
1 fan(s)
Fan location
Top
On/off switch
Yes

Logistics data

Harmonized System (HS) code
84733020

Packaging content

Cables included
AC, CPU, DC, PCIe, Peripheral (Molex), SATA

Customer Reviews

Share your opinion on the product or read reviews from other members.