Corsair RM1000x 1000W ATX 3.1 Power Supply

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Product guide

Corsair RM1000x 1000W ATX 3.1 Power Supply

Corsair RM1000x is a 1000W internal power supply with fully modular cables, ATX 3.1 compliance and a native 12V-2x6 connector. Its listed efficiency certification and cable setup may suit a PC build where modern GPU power connections and tidy wiring matter.

At a glance

Fully modular cables let builders connect only the leads their system uses.
A native 12V-2x6 connector is listed for direct GPU-to-PSU connection without an adapter.
The listing states ATX 3.1 compliance and PCIe 5.1 support.
The manufacturer claims Cybenetics Gold certification and up to 91% efficiency.
Embossed, flexible cables and low-profile combs are described as installation aids.

Price

$164.99Save 21%

Reference price: ~~$209.99~~

Price checked: Nov 14, 2026

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Pros and cons

Pros

Fully modular cabling can reduce unused leads inside a build.
Native 12V-2x6 connection can simplify cabling for compatible graphics cards.
The manufacturer states a ten-year warranty.

Technical specifications

14 specifications

Identity and output
Brand	Corsair
Model	RMx
Output wattage	1000 watts
Connector type	ATX
Form factor	Internal
Cooling method	Air
Fan count	1
Current rating	25 A

Standards and cabling
Power supply design	Full Modular
Compliance	ATX 3.1 compliant with PCIe 5.1 support
GPU power connector	Native 12V-2x6 connector

Dimensions and installation
Dimensions listed	2.3 x 3.39 x 5.91 inches
Weight listed	6.9 pounds

Manufacturer claims
Warranty description	10 Year Manufacturer

What to know before buying

Listing details to confirm

The listed dimensions are 2.3 x 3.39 x 5.91 inches, so compare them with the case's PSU clearance before buying. The manufacturer describes a 140mm FDB fan, while the specifications also list one fan without giving its size. Customer feedback reports mixed durability and motherboard compatibility, so confirm fit for the exact system and review warranty terms.

Who is it for?

A good fit for

PC builders seeking a 1000W fully modular PSU with ATX 3.1 and a native 12V-2x6 connection.
Builders who want to connect only the power cables their system needs.

Less suited to

Buyers whose case or system requires a different PSU size or connector arrangement.
Buyers who need assured compatibility with a particular motherboard without checking its requirements.

Corsair RM1000x 1000W ATX 3.1 Power Supply · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 813 ratings

5 stars83%83%
4 stars3%3%
3 stars3%3%
2 stars2%2%
1 star9%9%

Customer feedback highlights quiet operation, cable management and power quality, with some buyers also praising efficiency at low loads. Those impressions are relevant to a modular 1000W unit advertised with flexible cables and efficiency certification, but they do not establish performance for every build. Feedback on durability and motherboard compatibility is mixed, so buyers should confirm system fit and weigh the reported reliability concerns.

Positive themes

Customers describe operation as quiet, including reports of an inaudible fan.
Customers appreciate the modular cable arrangement and power quality.

Mixed feedback

Durability feedback ranges from reports of a robust unit to reports of failure within 1.5 years.
Compatibility feedback varies, including reports that it does not work with every motherboard.

Frequently asked questions

Is the Corsair RM1000x fully modular?

Yes. The listing describes it as fully modular, with cables connected as needed.

Does it have a native 12V-2x6 connector?

Yes. The listing claims a native 12V-2x6 connector for direct connection to compatible graphics cards.

What efficiency certification is stated?

The listing claims Cybenetics Gold certification and says it is rated for up to 91% efficiency. These are manufacturer claims, not independent measurements here.

What should I check before installation?

Check that the listed dimensions fit your case and that the PSU and cable connections match your motherboard and other components.