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Corsair

CORSAIR RM850x Fully Modular ATX Power Supply - 80 PLUS Gold - Low-Noise Fan - Zero RPM - Black

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Availability: Only 4 left in stock, order soon!
Fulfilled by GeekTown (we record product serial number)
Arrives Oct 7 – Oct 12
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Style: RMx (2021)


Size: 850W


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

The product is multiple voltage compatible, that voltage arrange is 100-240V.

Model Name: RM850X


Brand: Corsair


Compatible Devices: Personal Computer


Connector Type: ATX


Output Wattage: 850


Form Factor: ATX


Wattage: 850 watts


Cooling Method: Air


Item dimensions L x W x H: 6.3 x 5.91 x 3.39 inches


Item Weight: 1.7 Kilograms


Brand: ‎Corsair


Series: ‎RM850X


Item model number: ‎CP-9020200-NA


Item Weight: ‎3.74 pounds


Product Dimensions: ‎6.3 x 5.91 x 3.39 inches


Item Dimensions LxWxH: ‎6.3 x 5.91 x 3.39 inches


Color: ‎Black


Manufacturer: ‎Corsair


Date First Available: ‎June 22, 2022


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Oct 7 – Oct 12

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • Buyers, be aware
Style: RMx (2024) - ATX 3.1 Size: 1000W
The description is somewhat misleading, as the 2024 refresh is a platinum power supply masquerading as gold (lower). The box and cybenetics website confirm it. That is a great performance anywhere near the price point. Well, always nice when a product delivers over the target spec rather than under, so kudos for Corsair. From the user perspective, the psu is great, runs rtx 5090 with no or minimal noise, the cables are individually sleeved and of high quality you'd expect from Corsair. This also helps quickly check the 12V-2x6 connector by hand to make sure no individual wire is super hot. The 12V-2x6 connector has a good latch and locks solidly. Clean, minimal packaging, easy to install. There are enough connectors to power almost any reasonable system. Overall, if you have gotten to this review, I strongly recommend buying it for most any use case in 2025. ... show more
Reviewed in the United States on August 20, 2025 by D Soselia
    • This is an easy pick for a quality power supply at a fair price
Style: RMx (2024) - ATX 3.1 Size: 1000W
Knowing Corsair's generally solid reputation for power supplies, and seeing good reviews on Reddit, I grabbed the RM1000x to support my GPU upgrade from an NVIDIA 2080 to a 3090. An online calculator estimated I only needed about 700 watts for my system, but I wanted power to spare for eventual use in my next build. This model definitely felt like a quality unit, which lined up with what I was expecting. So far, so good. It's been running smooth for about a month now and I have no complaints, just steady power. The modular cables were a nice improvement over my previous supply and made the upgrade pretty easy. I only plugged in what I needed, making the cable routing look much nicer in my case. It's quiet and reliable and I haven't had to think about it since the initial install. Of course, that is exactly what you want when it comes to a power supply! I feel confident this was a good value and money well spent compared to cheaper alternatives. ... show more
Reviewed in the United States on May 7, 2025 by BrianG
    • Incredible PSU
Style: RMx (2024) - ATX 3.1 Size: 850W
The Corsair RM850x is a solid choice for anyone building a high-performance PC. Its fully modular design makes cable management a breeze, and the included cables feel both durable and flexible, allowing for a clean and organized setup. One of the standout features is the ability to control the PSU’s fan noise levels, which helps maintain a quieter system under different loads. Additionally, its A+ rating in PSU tier list confirms its reliability and efficiency. Overall, it's a great PSU for the money ... show more
Reviewed in the United States on August 3, 2025 by Oscar C.
    • Stability, ease of use, quiet, and a well established design.
Style: RMx (2024) - ATX 3.1 Size: 850W
Bought this 850 watt unit 6 months ago and just now last week installed it. Everything went smooth, my son did most of it, no problems with cables or routing or anything. I love the feature of being able to control the fan speed. This is a well built, well known PSU. It is performing as expected, which is quiet, cool and stable. Highly recommend this unit from Corsair. ... show more
Reviewed in the United States on September 7, 2025 by doug
    • The RM1000x is an excellent PSU with individually sleeved cables.
Style: RMx (2024) - ATX 3.1 Size: 1000W
I bought this Corsair RM1000x ATX 3.1 (2024) PSU to replace a faulty ASRock PSU. As one other review mentioned, the Cybenetics rating on the box for power efficiency has been recently updated from Gold to Platinum, which will help keep long term energy costs down for people who live in areas with expensive electricity. When unboxed, the power supply feels and looks like a premium product, and indeed it is. The modular cables in the box all come with individually sleeved wires, and the 12V 2x6 connector and ATX 24 pin connectors come with clamshell style cable combs preinstalled, which seems to be a newer development with this unit. I looked at multiple tech site reviews of this power supply and the only one with cable combs I found was the Kit Guru review, and those were manually installable traditional style combs. The cables did have a bit of a petrochemical smell to them, but it was far better than the ASRock unit I replaced. The cables on the RM1000x are also longer and more flexible than on the ASRock unit, making routing in my mid-tower case easier, specifically for the CPU (length) and ATX 24 pin (flexibility). The power supply performs exceptionally well, making absolutely no coil whine noise at any load, and works completely silently at loads below 500 watts. The fan control knob on the back of the unit comes out of the box set to 0 RPM low noise mode, leaving the fan off until the aforementioned 500 watt limit is exceeded. If you don't care about 0 RPM low noise mode, you can adjust the knob clockwise until it clicks, at which point you're manually controlling the fan, allowing you to set a constant fan speed anywhere in the fans RPM range. One thing to note is that the 12V 2x6 connector that comes in the box only has 2 of the four sense pins, but this is totally fine, as it powers my RTX 5080 without issue, so don't be concerned that two sense wires are "missing". I was extremely lucky to get this unit at a cheaper price only a day before it raised to its current price, but even around the $200 mark, this power supply is worth the price. Overall I give this power supply a 9/10, and only because I don't like that the fan is gray instead of black, which honestly is likely a complete non-issue for most people. ... show more
Reviewed in the United States on May 31, 2025 by Marlena

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