Power Supply - Corsair RMx Shift RM850x 850 W ATX 3.1 Black
Product reference: 14-840440484974

Corsair RMx Shift RM850x is a fully modular 850W ATX 3.1 power supply for desktop computers. It features 80 PLUS Gold efficiency, a 140mm FDB fan, and 24-pin ATX, EPS, SATA, and PCIe power connectors.

Power Supply - Corsair RMx Shift RM850x 850 W ATX 3.1 Black

Product reference: 14-840440484974

Corsair RMx Shift RM850x is a fully modular 850W ATX 3.1 power supply for desktop computers. It features 80 PLUS Gold efficiency, a 140mm FDB fan, and 24-pin ATX, EPS, SATA, and PCIe power connectors.

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Corsair RMx Shift RM850x 850W ATX power supply, black


The Corsair RMx Shift RM850x is a fully modular 850W ATX 3.1 desktop power supply. It features 80 PLUS Gold efficiency, a 140mm FDB fan, and 24-pin ATX, EPS, SATA, and PCIe power connectors.


  • 850W fully modular ATX desktop power supply
  • 80 PLUS Gold efficiency for reliable and energy-efficient operation
  • Complies with the ATX 3.1 standard, has a special 12V-2x6 PCIe connector for modern graphics cards
  • Quiet 140mm FDB fan with active cooling and zero-speed mode

Product information

Product type Desktop power supply
Model Corsair RMx Shift RM850x
Color Black
Form factor ATX
Cables Fully modular

Electrical specifications

Total output power 850W
+12V output 850 W; up to 70.8 A
+5V output 120 W; up to 20 A
+3.3V output 120 W; up to 20 A
+5VSB exit 15 W; up to 3 A
AC input voltage 100-240V
AC input frequency 47-63 Hz
Input current 5-10A

Connectors

Motherboard connector 24 contacts ATX
Processor connector 4+4 pin EPS
Modern graphics card connector 1 × 12+4-pin PCIe
Additional graphics card connectors 2 × 6+2-pin PCIe
SATA power connectors 9
PATA power connectors 4

Cooling and construction

Cooling system Active cooling with one 140 mm fan
Fan bearing Fluid Dynamic Bearing (FDB)
Fan operation Zero speed mode supported
Power switch Yes
Mean time between failures 100,000 hours

Physical specifications

Dimensions 160 × 86 × 150 mm (width × height × depth)
Weight 2.89 kg
Motherboard cable length 61 cm
PCIe cable length 650mm
SATA cable lengths 100, 500 and 700 mm

Safety warning

Important For installation in compatible desktop systems only. Disconnect mains power before installation or servicing. Use only the supplied modular cables; using cables from other power sources may damage components or create a fire hazard.

Height150mm
Length300mm
Weight4000 grams
Width250mm
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