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Corsair

Corsair RM850x SHIFT Fully Modular ATX Power Supply - 80 PLUS Gold - ATX 3.1 - PCIe 5.1 - Zero RPM - Modular Side Interface - Black

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Availability: In Stock.
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Arrives Monday, Apr 27
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Style: RMx Shift (ATX 3.0 & PCIe 5.0)


Size: 850W


Features

  • Fully Modular Micro-Fit PSU Connectors: CORSAIR Type 5 Gen 1 micro-fit PSU cables mean you only connect the cables your system needs while taking up less space.
  • Intel ATX 3.1 Certified: Compliant with the ATX 3.1 power standard, supporting the PCIe Gen 5.1 platform and resisting transient power spikes.
  • Zero RPM Fan Mode Support: At low and medium loads the cooling fan switches off entirely for near-silent operation.
  • 100% 105C-Rated Japanese Electrolytic Capacitors: Premium internal components deliver unwavering power delivery and long-term reliability.
  • Modern Standby Compatible: Extremely fast wake-from-sleep times and better low-load efficiency.

Description

CORSAIR RMx SHIFT Series fully modular power supplies boast a revolutionary side cable interface to keep all your connections within quick reach, for exceptionally convenient 80 PLUS Gold efficient power. With fully modular micro-fit connections and ATX 3.0 compliance, RMx SHIFT makes clean PC builds and upgrades even easier. RMx SHIFT PSUs use Japanese 105°C-rated electrolytic capacitors, for long life and reliability backed by a ten-year warranty. A 140mm fluid dynamic bearing fan utilizes a specially calculated fan curve for high performance and reliability with low noise, while Zero RPM mode support ensures virtually silent operation at low and medium loads. For quiet, efficient, and accessible power, put an RMx SHIFT Series PSU on your side.

Model Name: RM850x SHIFT


Brand: Corsair


Compatible Devices: Personal Computer


Connector Type: ATX, EPS


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 5.08 inches


Item Weight: 3.8 Pounds


Brand: ‎Corsair


Series: ‎RM850x SHIFT


Item model number: ‎CP-9020252-NA


Item Weight: ‎3.8 pounds


Product Dimensions: ‎6.3 x 5.91 x 5.08 inches


Item Dimensions LxWxH: ‎6.3 x 5.91 x 5.08 inches


Color: ‎Black


Manufacturer: ‎Corsair


Date First Available: ‎January 31, 2023


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Apr 27

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

    • Highest quality PSU, yet again
Style: RMx Shift (ATX 3.0 & PCIe 5.0) Size: 1200W
Corsair delivers again! This is the third time I've used a Corsair power unit for a self/custom build, and with EVGA gone, I will never stray from them again! I can't speak to their peripherals, but the power units are incredibly high quality, have decent tech support, and come with connectors that just about every enthusiast/custom builder would ever need. The cables can bit a little bit stiff, but they do sell (for a premium price) softer and more flexible cables on their site. I wish these custom cables were a little bit cheaper, but it does speak to how modular and high quality their PSUs are. ... show more
Reviewed in the United States on August 30, 2025 by Sweet Sweet Goods
    • Glad I chose this one
Style: RMx Shift (ATX 3.0 & PCIe 5.0) Size: 1000W
Runs my RTX 5080 and my i9 14900k seamlessless with lights and other accessories perfectly. This thing is a monster. She fits perfectly, actually better than I had expected when doing a measurement check before I ordered. It is quiet and I had to actually shine my light on it to be sure it was actually running ideally. Connections were perfect and sturdy. ... show more
Reviewed in the United States on August 30, 2025 by Alec
    • Excelente producto
Style: RMx Shift (ATX 3.0 & PCIe 5.0) Size: 1000W
Super silenciosa y potente. El sistema shift hace las cosas mucho mas facil.
Reviewed in the United States on September 27, 2025 by Francisco Heinze
    • As Advertised
Style: RMx Shift (ATX 3.0 & PCIe 5.0) Size: 1200W
As Advertised
Reviewed in the United States on October 5, 2025 by Sandan
    • Muy buena
Style: RMx Shift (ATX 3.0 & PCIe 5.0) Size: 850W
Ya tengo tiempo y sin problemas, está muy sencillo de instalarlo con las instrucciones
Reviewed in the United States on September 14, 2025 by Luis Junior
    • Couldn't be happier; what a design!
Style: RMx Shift (ATX 3.0 & PCIe 5.0) Size: 1200W
I’ve always hated how traditional PSU cables connect — reaching around the back, cramming fingers into tight spaces. That’s why I was excited about the Corsair Shift 1200X’s side-access design, and I’m happy to report: in real-world use, it’s even more convenient than I expected. ✅ Ease of installation: The side-mounted connectors make cable management a breeze, especially in larger cases where you have the rear panel clearance. For newer PC builders, this layout is much easier to work with compared to standard designs. ⚠️ Important tip: Before you buy, check your case dimensions carefully. If you’re building in a micro-ATX or ITX case, measure twice — this PSU’s side-access layout requires extra clearance on the rear side panel that small cases may not have. ✅ Noise & cooling: I can barely hear this PSU even under load, so I assume it’s cooling efficiently. No noticeable coil whine or fan ramping in my system. ✅ Cabling quality: I was pleasantly surprised by the included Corsair Type 5 cables — they’re flexible, well-made, and didn’t make me feel the need to swap them for aftermarket ones.lling I figured I would do a cable swap but was actually satisfied by the quality of cables it came with already ... show more
Reviewed in the United States on May 24, 2025 by TheLEGinCLEGG
    • 100% it works.
Style: RMx Shift (ATX 3.0 & PCIe 5.0) Size: 1200W
Its a power supply and it powers my PC didn't fry or anything and it works great. So good job Corsair!!!!
Reviewed in the United States on August 21, 2025 by Carl
    • Shutting off under load
Style: RMx Shift (ATX 3.0 & PCIe 5.0) Size: 1200W
Just built a brand new machine with an AMD 7800X3D and Sapphire RX 7900 XTX. While under load the system just powers off, like instant black screen with no debug info recorded. I have to flip the switch on the back off then on again to get the system powered up again. When gaming the system temps average 70C for the CPU and 65C for the GPU, so it's not a temperature issue. I was able to run a CPU stress test for 6 hours without a problem hitting a cap of 86C on the CPU. I swapped the GPU out for a 7600 which did not encounter any problems. The Sapphire 7900 XTX takes three 8 pins, and the PSU came with 4 8pins and 2 dual-8pins. Given past experiences I have tried using three independent lines, as well as one shared. I also tried using different modular 8pin ports on the PSU, but since there is nothing in the manual about preferred or designated ports for power I can't tell if I'm doing it wrong or if the PSU is just unable to deliver, which makes no sense for a 1200W rated component... Anyways, I have ordered a Be Quiet and will swap it out to see if that works, since it could still be a GPU problem. However since I can game without issue for half a day if I keep the settings low I have to imagine it's just a power draw problem. I emailed Corsair for support, and so I'll follow up if they suggest a solution, but for now giving this 1 star. Could just be quality control for corsair, but I only build a machine every few years so it sucks to win the lottery. ... show more
Reviewed in the United States on February 5, 2024 by Casey DeLorme

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