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CORSAIR RM850x ATX 3.1 PCIe 5.1 750W Power Supply – Black

CORSAIR RM850x ATX 3.1 PCIe 5.1 750W Power Supply – Black

Bottom line: The CORSAIR RM850x ATX 3.1 PCIe 5.1 750W Power Supply: Native 12V-2x6 connector powers new GPUs directly, no adapter needed; main trade-off: listing title says both RM850x and 750W, so confirm the wattage before buying.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014, focused on GPU performance across gaming, rendering, and local-LLM inference. Synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides.

Pros & Cons

Pros

  • ✓ Native 12V-2x6 connector powers new GPUs directly, no adapter needed
  • ✓ ATX 3.1 compliant with PCIe 5.1 support for transient power spikes
  • ✓ Cybenetics Gold certified, rated up to 91% efficiency
  • ✓ 140mm FDB fan built for low-noise cooling
  • ✓ 100% Japanese 105°C capacitors, backed by a ten-year warranty

Cons

  • ✗ Listing title says both RM850x and 750W, so confirm the wattage before buying
  • ✗ Gold-tier efficiency; Platinum or Titanium units waste less power as heat
  • ✗ Cable counts and lengths aren't listed; check the spec sheet against your case
  • ✗ Modular 12V-2x6 plug must be fully seated at both ends to avoid connection issues

Manufacturer description

The CORSAIR RM850x is a fully modular ATX 3.1 power supply for modern gaming PCs that need clean, quiet power and a direct cable to the latest graphics cards. It is part of Corsair's RMx low-noise series. A native 12V-2x6 connector runs straight from the PSU to your GPU, so you don't need an adapter or a bundle of 8-pin cables. ATX 3.1 compliance and PCIe 5.1 support mean it is built to handle the short power spikes that current high-end GPUs produce. Cybenetics Gold certification puts efficiency at up to 91%, which means less wasted heat and lower power draw. Inside are 100% Japanese…

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SpecPicks Verdict

SpecPicks scored CORSAIR RM850x ATX 3.1 PCIe 5.1 750W Power Supply using a rating × review-volume × price-fit model applied to published specs and reviews across the power supplies category. Compare with similarly-priced alternatives in the power supplies category before committing. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for power supplies of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

Does the Corsair RM850x work with new graphics cards that use a 12V-2x6 or 12VHPWR plug?

Yes. It has a native 12V-2x6 connector that runs directly from the PSU to the GPU, so you don't need an adapter. It also complies with ATX 3.1 and supports PCIe 5.1.

Is this power supply 850W or 750W?

The listing title names the RM850x model but also says 750W. Check the wattage on the product listing or the label image before you buy, and size it to your GPU and CPU power draw.

Is the Corsair RM850x fully modular?

Yes. Every cable is modular, so you only connect the ones your build needs. The cables are embossed and flexible, and low-profile combs help keep routing tidy.

How loud and efficient is the RMx series?

It carries Cybenetics Gold certification, rated for up to 91% efficiency. Cooling comes from a 140mm fluid dynamic bearing (FDB) fan in a low-noise design, and the unit uses 100% Japanese 105°C-rated electrolytic capacitors.

What warranty comes with the Corsair RM850x?

Corsair backs the RMx series with a ten-year warranty. Check Corsair's warranty page or the product listing for the current terms and registration requirements.

Key Features

  • 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.

Full Specifications

BrandCorsair
ColorBlack
Wattage850 watts
Model NameRMx
Form FactorATX
Model NumberCP-9020270-NA
Fully ModularReliable and efficient low-noise power supply with fully modular cabling, so you only have to connect the cables your system needs.
Built-In MediaItem
Connector TypeATX
Cooling MethodAir
Number of Fans1
Output Wattage850 watts
Item Dimensions2.3 x 3.39 x 5.91 inches
Mfr Part NumberCP-9020270-NA
Number of Items1
ATX 3.1 CompliantCompliant with the ATX 3.1 power standard from Intel, supporting PCIe 5.1 and resisting transient power spikes.
Compatible DevicesMonitor
Power Supply DesignFull Modular
Warranty Description10 Year Manufacturer
Maximum Input Voltage264 volts_of_alternating_current

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CORSAIR RM850x ATX 3.1 PCIe 5.1 750W Power Supply – Black is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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CORSAIR RM850x ATX 3.1 PCIe 5.1 750W Power Supply – Black
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