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Corsair

CORSAIR RM1000x Fully Modular ATX Power Supply - 80 Plus Gold - Low-Noise Fan - Zero RPM - Black

  • Based on 11,118 reviews
Condition: Used - Like New
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Style: RMx (2021)


Size: 1000W


Features

  • Fully Modular: Only connect the cables your system needs, making clean and tidy builds easier.
  • 135mm Magnetic Levitation Fan: Utilizes a magnetic levitation bearing and custom engineered rotors for high performance, low noise, and superior reliability.
  • EPS12V Connector: For wide compatibility with modern graphics cards and motherboards.
  • 100% All Japanese 105C Capacitors: Premium internal components ensure unwavering power delivery and long-term reliability.
  • Modern Standby Compatible: Extremely fast wake-from-sleep times and better low-load efficiency.
  • 80 PLUS Gold Certified: High efficiency operation for lower power consumption, less noise, and cooler temperatures.

Description

CORSAIR RM1000x Series fully modular power supplies with EPS12V connectors are built with the highest quality components to deliver 80 PLUS Gold efficient power to your PC. RM1000x PSUs use only Japanese 105°C capacitors, for long life and reliability backed by a ten-year warranty. A 135mm magnetic levitation bearing fan ensures high performance coupled with low noise.

Model Name: RM1000x


Brand: Corsair


Compatible Devices: Personal Computer


Connector Type: ATX


Output Wattage: 1000 Watts


Form Factor: ATX


Wattage: 850 watts


Cooling Method: Air


Item dimensions L x W x H: 7.09 x 5.91 x 3.39 inches


Item Weight: 2 Kilograms


Brand: ‎Corsair


Series: ‎RM1000x


Item model number: ‎CP-9020201-NA


Item Weight: ‎4.4 pounds


Product Dimensions: ‎7.09 x 5.91 x 3.39 inches


Item Dimensions LxWxH: ‎7.09 x 5.91 x 3.39 inches


Color: ‎Black


Manufacturer: ‎Corsair


Date First Available: ‎June 14, 2021


Frequently asked questions

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Top Amazon Reviews

🚀 Abunda's Overview

This is our summary and key points to consider based on customer reviews.

The Corsair RM850x fully modular power supply unit (PSU) has been praised for its excellent efficiency and silent operation, with notable features including an impressive low-noise fan, exceptional power delivery, and a great build quality. One unique factor to consider, however, is the design of its shift model, specifically suited for side-mounted PSU slots; this may not be compatible with some cases and can present wiring and heat dissipation challenges.

Pros

  • 👍 High-quality build, solid, and durable
  • 🌟 Excellent power efficiency and power delivery
  • 🔇 Very quiet operation, with Zero RPM fan mode
  • ⚙️ Great modularity allowing for easy cable management

Cons

  • ⚠️ May not fit into smaller PC cases because of its size
  • 🔄 In the Shift model, side out connector may not be intuitive for some setups
  • 💼 The Shift model might cause some spacing issues in narrower cases
  • ⚡ Potential heat dissipation challenges due to wiring placement (again in Shift model)

Should I Buy It?

If you're seeking a high-quality, highly efficient PSU that offers seamless and quiet operation, the Corsair RM850x undoubtedly fits the bill. However, be mindful of whether the fully modular design suits your particular PC case and setup. If you're considering the Shift model, ensure that it fits with the space and wiring layout of your case. Overall, this PSU is certainly a worthwhile investment for tech-savvy users and gamers.

    • Trustworthy PSU
Style: RMx (2021) Size: 850W
Really well made product. Just for a good set up. I paired it with a i7 13700k and a 4070 super with around 8th fans. Works really good with no issues. It is quiet and will allow an upgrade for a 5080 or something like that. Really good one
Reviewed in the United States on December 19, 2025 by Kenny E.
    • Excellent PSU
Style: RMx (2021) Size: 750W
Clean, efficient, and easy to use. Running my 10850k, 4070, and all the other crap shoved in my tower with zero issues. Modularity is excellent for keeping your system from being a spaghetti mess by only using the cables you need. Included molex cable is excellent if your still using some older hardware or fan hubs. You get what you pay for and corsair is worth the cost to keep your system running stable. ... show more
Reviewed in the United States on December 6, 2025 by joe c
    • Reliable Power Delivery with Efficiency and Modular Design!
Style: RMx (2021) Size: 750W
The Corsair RMX Series (2021) RM750x is a 750 Watt power supply that exemplifies reliability, efficiency, and modular design. This power supply unit (PSU) has surpassed my expectations, providing stable and consistent power delivery while offering a convenient and tidy cable management solution. The standout feature of the Corsair RM750x is its robust 750 Watt power output. This wattage is more than enough to handle high-end gaming rigs and power-hungry components, ensuring that my system gets the required power for peak performance. With an 80 Plus Gold certification, the RM750x guarantees high energy efficiency, reducing power wastage and lowering electricity bills. Its power efficiency also translates into less heat generation, leading to quieter operation and improved system longevity. The fully modular design of the RM750x is a game-changer for cable management. It allows me to connect only the necessary cables, minimizing clutter and maximizing airflow inside my PC case. This results in a clean and organized build with improved cooling capabilities. The PSU's zero RPM fan mode ensures silent operation during low to medium loads, as the fan only spins up when required, keeping noise levels at a minimum, even during intense gaming sessions. The RM750x comes equipped with high-quality Japanese capacitors, ensuring exceptional reliability and stability. These capacitors contribute to the PSU's long lifespan and consistent performance. Corsair is a reputable brand known for its high-quality PC components, and the RMX Series continues that tradition. The RM750x is a testament to Corsair's commitment to providing top-tier power supplies for enthusiasts and professionals. In conclusion, the Corsair RMX Series (2021) RM750x is a reliable and efficient power supply unit that offers stable power delivery and a modular design for easy cable management. Its 750 Watt power output, 80 Plus Gold certification, and silent operation make it the ideal choice for powering high-performance gaming systems. If you're looking for a premium power supply with excellent efficiency and clean cable management, the Corsair RM750x is the perfect option. I highly recommend this PSU for its outstanding performance and the peace of mind it brings to my PC build! ... show more
Reviewed in the United States on August 3, 2023 by Steven
    • Quality product
Style: RMx (2024) - ATX 3.1 Size: 850W
Relatively easy to install, and it’s performance is as expected
Reviewed in the United States on December 16, 2025 by Nelson Tovar
    • Outstanding Power and Efficiency for High-Performance Systems!
Style: RMx (2021) Size: 1000W
The Corsair RMX Series (2021), RM1000x, 1000 Watt power supply is an absolute powerhouse that has exceeded my expectations in every way. As an enthusiast with a high-performance system, finding a reliable and efficient power supply is crucial, and the RM1000x delivers exceptional performance. First and foremost, the power delivery of this PSU is outstanding. With a whopping 1000 watts of power, it effortlessly handles the demands of my system, including multiple graphics cards, high-end processors, and numerous peripherals. It ensures a stable and consistent power supply, preventing any fluctuations that could potentially harm my components. The efficiency of the RM1000x is equally impressive. It is 80 PLUS Gold certified, which means it operates with high energy efficiency, minimizing wasted energy and reducing heat generation. This not only helps to lower my electricity bills but also keeps my system running cooler, ultimately extending the lifespan of my components. Another notable feature of the RM1000x is its modular design. The fully modular cables provide excellent flexibility and ease of cable management. It allows me to connect only the cables I need, reducing clutter inside my system and improving airflow. The cables themselves are of high quality and feel robust, ensuring a reliable and secure connection. Corsair's attention to detail and build quality are evident in the RM1000x. The power supply unit is solidly constructed, and the fan operates quietly, even under heavy load. The zero RPM fan mode is particularly useful during idle or low-load scenarios, ensuring silent operation and minimizing unnecessary noise. Moreover, the RM1000x features an array of advanced protection features, including over-voltage, under-voltage, and short-circuit protection. These safeguards give me peace of mind, knowing that my system is well-protected against any potential electrical issues. ... show more
Reviewed in the United States on May 20, 2023 by Digitalfanatic
    • Great PSU. Zero problems or issues.
Style: RMx (2021) Size: 1000W
Used it to power my i9 9900 and 4080. No problems for the last few years. I only switched out to a RM1200 because I upgraded to a 5090 and 9950x3d. The 1000w is still in my old computer as backup and probably can be used as backup for my current computer for light work.
Reviewed in the United States on October 26, 2025 by MC

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