Search  for anything...
Corsair

CORSAIR RM850x Fully Modular Low-Noise ATX Power Supply – ATX 3.1 Compliant – PCIe 5.1 Support – Cybenetics Gold Efficiency – Native 12V-2x6 Connector – Black

  • Based on 716 reviews
Condition: New
Checking for the best price...
$139.99 Why this price?
Save $30.00 was $169.99

Buy Now, Pay Later

As low as $23.33 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: Only 1 left in stock, order soon!
Fulfilled by Nutrend Automotive Inc
Arrives Thursday, Jul 16
Order within 7 hours and 44 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Style: RMx (2024) - ATX 3.1


Size: 850W


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.

Description

CORSAIR RMx Series Fully Modular Low-Noise Power Supplies deliver quiet, dependable power with Cybenetics Gold efficiency to your PC. Fully modular, ultra-flexible embossed cables make PC builds easy, as you connect only the cables your system requires. Compliant with the ATX 3.1 power standard from Intel®, RMx PSUs have the connections needed to power today’s demanding PC hardware including a native 12V-2x6 connector. 100% Japanese 105°C-rated electrolytic capacitors deliver fantastic electrical performance, while a 140mm FDB fan provides low noise cooling. Backed by a ten-year warranty, RMx PSUs are the gold standard for many years to come.

Model Name: RMx


Brand: Corsair


Compatible Devices: Monitor


Connector Type: ATX


Output Wattage: 850 Watts


Form Factor: ATX


Wattage: 850 watts


Cooling Method: Air


Item dimensions L x W x H: 2.3 x 3.39 x 5.91 inches


Item Weight: 3.9 Pounds


Compatible Devices: Monitor


Connector Type Used on Cable: ATX


Output Wattage: 850 Watts


Form Factor: ATX


Wattage: 850 watts


Cooling Method: Air


Power Supply Design: Full Modular


Number of Fans: 1


Maximum Input Voltage: 264 Volts (AC)


Minimum Input Voltage: 100 Volts (AC)


System Bus Connector Type: ATX


Item Dimensions: 2.3 x 3.39 x 5.91 inches


Item Weight: 3.9 Pounds


Model Name: RMx


Brand: Corsair


Manufacturer: Corsair


UPC: 840006667506


Mfr Part Number: CP-9020270-NA


Model Number: CP-9020270-NA


Warranty Description: 10 Year Manufacturer


Built-In Media: Item


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Jul 16

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Corsair remains as reliable as ever
Style: RMx (2024) - ATX 3.1 Size: 850W
For as long as I've been building my own computers - more than twenty-five years now - I've used Corsair power supplies. I don't necessarily think they are better than any other brand, but they've never let me down, despite all my computers generally running 24/7 in dusty, sometimes humid, sometimes 90F environments. I purchased this not because my old Corsair supply failed, but because I was installing a 5070Ti and wanted higher output as a result - the 650W would have barely been suitable. Swapping supplies was dead simple; the old one slotted in place of my old RM650x, and all I needed to do is replace the old power cable from the RX470 with the newer 12V-2x6pin. I have all Cablemod Sleeved cables and debated replacing the the new 12-pin connector with a sleeved variant, but it's so flexible and clean looking I decided the Corsair one was just fine. I've been running for about three months now without any issue. Obviously not much time on a PSU but I doubt I'll have problems. As an aside, this one has a variable fan speed knob. So far as I can tell, if you leave it off it will just run in normal, automatic mode, whereas if you use the knob it will instead always run at a certain speed. I think, I'm not totally clear on it. I just keep the knob off - my system is already very quiet and I don't think I've ever heard the PSU fan turn on even with my old supply, much less this newer one. As my mobo doesn't support PCIe 5.1, I can't comment on that part of the component. I would definitely recommend this RM850x, and would recommend Corsair in general, so far as PSUs are concerned. They seem very solid and well-made, and I've never been disappointed by them in the past. ... show more
Reviewed in the United States on December 12, 2025 by AC
    • 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
    • Best PSUs on the market
Style: RMx (2024) - ATX 3.1 Size: 850W
Corsair PSUs in my experience are always easy to work with. The cables are very easy to manage because they come with zip ties and braid organizers (if that is the right term for them). It is a very sleek design, and I really like the cables themselves. I have had no issues with performance, and I haven't had any issues with power to my PC. My estimated wattage is about 600, so this leaves me some room for upgrades if I want. You are definitely paying for less than you get with this, it is an extremely good investment in terms of what you get versus how much you pay. ... show more
Reviewed in the United States on July 23, 2025 by Drew Lipscomb
    • Solid choice for average gamers.
Style: RMx (2024) - ATX 3.1 Size: 850W
Holds up very good during intense gaming, low fan rpm option, atx factor
Reviewed in the United States on June 12, 2026 by Nevin
    • Quiet reliable power Quiet reliable power
Style: RMx (2024) - ATX 3.1 Size: 850W
Review Image by Duane Cutlip
Quiet consistent power. I wanted to upgrade and build a nice quiet system. Went for a little overkill on a few specs, but built around the RM850x for consistent, reliable, and quiet power. Fits my Cooler Master case perfectly with plenty of cables for all my components. I've got a bunch stuffed in my case, but he modular design ensures I don't have more wires running around than I need. Cables are plenty long for tucking away so I maintain good airflow. ... show more
Reviewed in the United States on June 15, 2026 Reviewed in the United States on June 15, 2026 by Duane Cutlip
    • 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.
    • high quality item
Style: RMx (2024) - ATX 3.1 Size: 850W
Exactly what I needed, great for a mid to high end gaming PC. I would not go dual GPU with this though, I'd buy something with more overhead to be safe.
Reviewed in the United States on June 14, 2026 by Crab Monster
    • It handled like a champ.
Style: RMx (2024) - ATX 3.1 Size: 850W
I bought one years ago and lightning struck my house. This power supply took a jolt and kept on working. So, I bought another one (this one, lol). These power supplies are great. Easy to setup and use. Pretty easy cable management do to it being fully modular. Its very quiet except when you adj7st the fan to high. Its not l9ud, but you can definitely tell it's moving air, lol. The nob on the back adjusts the fan speed if you want more cooling. Well worth the buy. ... show more
Reviewed in the United States on September 5, 2025 by IamKraZ

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...