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Corsair

CORSAIR RM850x ATX 3.1 PCIe 5.1 750W Power Supply – Black

  • Based on 782 reviews
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Availability: In Stock.
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Arrives Monday, Oct 19
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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_of_alternating_current


Minimum Input Voltage: 100 volts_of_alternating_current


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


Number of Items: 1


Manufacturer: Corsair


UPC: 840006667506


Built-In Media: Item


Model Number: CP-9020270-NA


Mfr Part Number: CP-9020270-NA


Warranty Description: 10 Year Manufacturer


Item Highlight: Native 12V-2x6 Connector, Fully Modular, Low-Noise, Cybenetics Gold, NA


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Oct 19

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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Top Amazon Reviews

    • Good
Style: RMx (2024) - ATX 3.1 Size: 850W
Works perfectly fine and have had no trouble with this power supply. The 850 battery is more than enough for my computer, plus some just in case. Has held up for a few months now so worth it in my opinion. Appreciated all the extra cables that came with it too, even though I didn’t need to use them all. Should be good for a longer time. ... show more
Reviewed in the United States on July 31, 2026 by L
    • 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
    • Great PSU
Style: RMx (2024) - ATX 3.1 Size: 850W
Review Image by Christian
Very quiet and haven’t had any issues with cooling, overall very reliable PSU
Reviewed in the United States on July 14, 2026 by Christian
    • 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
    • Fantastic
Style: RMx (2024) - ATX 3.1 Size: 850W
Marvelous well packed
Reviewed in the United States on August 24, 2026 by Cesar Mendoza
    • 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 by Duane Cutlip
    • Very much worth to get
Style: RMx (2024) - ATX 3.1 Size: 850W
The power supply works very well. The noise is very low and unnoticeable 90% of the time. Haven't had a single issue with it. It's literally plug and play!
Reviewed in the United States on July 13, 2026 by Tommy
    • 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

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