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Rectangular black ATX power supply with modular cable sockets and a 135mm fan grille

Corsair

Corsair CP-9020093-NA RM850X 850W 80 PLUS GOLD Full Modular power supply

SKU CH-P81E-C5MWZ MPN CP-9020093-NA

Full-modular 850 W ATX unit with 80 PLUS Gold efficiency and a 135 mm Rifle Bearing fan

  • Max wattage850 W
  • Power efficiency90%
  • Modular cablingFull Modular
  • Fan configuration1 × 135 mm Rifle Bearing Fan
  • Power factor correctionActive
  • Main power connector24Pin
  • 850 W output powers demanding multi-GPU builds
  • 80 PLUS GOLD certification delivers 90% efficiency at typical loads
  • Full modular cabling keeps the case interior tidy
  • 135 mm Rifle Bearing fan enables ZeroRPM silent operation at low load
  • Single +12 V rail rated at 70.8 A ensures stable power delivery

850W Fully Modular ATX Power Supply

The Corsair RM850X delivers 850 W through a single +12V rail rated at 70.8 A. It carries 80 PLUS Gold certification for 90% efficiency and uses a fully modular cable set so only the required leads are installed. A 135 mm rifle-bearing fan supports ZeroRPM mode for silent running at low loads.

Suits Multi-GPU Builds; Avoid for Low-Power Systems

Six 6+2-pin PCIe connectors and two EPS cables make the unit ready for SLI or CrossFire configurations. Ten SATA and eight peripheral plugs cover large storage arrays. Builds that only need a fraction of this output should consider a lower-wattage model instead.

Single +12V Rail at 70.8 A Decides Fit

The entire 850 W is available on one +12V rail, simplifying power distribution for high-end graphics cards and CPUs. Verify that the combined 12 V demand of your components stays within 70.8 A before choosing this unit.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $119.99
Cheaper than about 59% of the 10,869 comparable items (median $142.99).
Max wattage 850 W
Typical for this category: the median of 930 items is 850 W.

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Specifications

Product
Brand nameCORSAIR
Product lineRMx Series
Model nameRM850X (CP-9020093-NA)
Product typeATX12 V / EPS12 V
Graphics
SLI supportReady
CrossFire supportReady
Ports & slots
PCIe power connectors6 × 6+2-Pin
SATA power connectors10
Output type+3.3 V @ 25A, +5 V @ 25A, +12 V @ 70.8A, -12 V @ 0.8A, +5VSB @ 3A
Connection types1 x ATX Connector
2 x EPS Connector
1 x Floppy Connector
8 × 4-Pin Peripheral Connector
6 x PCI-E Connector
10 x SATA Connector
Power
Max wattage850 W
Power efficiency90%
Modular cablingFull Modular
Power factor correctionActive
Main power connector24Pin
12V railsSingle
Efficiency certification80 PLUS GOLD Certified
Overvoltage protectionYes
Supply voltage100–240 V
AC input frequency47–63 Hz
Rated input current12–6A
Size & build
Product dimensions3.39 in × 7.09 in × 5.91 in
Product weight4.38 lb (1.99 kg)
Shipping weight3.96 kg
Package size394 × 226 × 150 mm
Compatibility
Haswell compatibilityYes
Environment & compliance
Regulatory approvalsFCC, ICES, CE, UL / CUL, CSA, C-Tick / RCM, TUV, CB, CU, KC Mark, RoHS, WEEE, RoHS (China), REACH
More details
Fan configuration1 × 135 mm Rifle Bearing Fan
Mean time between failures100,000 h

Questions about this item

Will this PSU fit a standard ATX case and provide enough connectors for a dual-GPU build?

The unit follows the ATX12V / EPS12V form factor and includes six 6+2-pin PCIe connectors, supporting SLI and CrossFire multi-GPU configurations.

Can I run it silently during light workloads?

ZeroRPM mode stops the 135mm rifle-bearing fan at low loads for fanless operation.

What AC input range does it accept for worldwide use?

It operates on 100 - 240 V at 47 - 63 Hz without a voltage switch.

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