CORSAIR RM850x Fully Modular ATX Power Supply - 80 PLUS Gold - Low-Noise Fan - Zero RPM - Black
Condition: Used - Very Good
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Availability:
Only 1 left in stock, order soon!
Arrives
Jul 1 – Jul 6
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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:
Jul 1 – Jul 6
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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Style: RMx (2024) - ATX 3.1
Size: 750W
i just wanted to share some things about this psu. i generally appreciated this power supply. i had no major issues and appreciated the upgrade, the only thing i wanted to note is that the motherboard cables were really hard to insert into the psu for me, which was pretty annoying to do given i'm working around an injured finger. nothing concerning, but it made it a little frustrating to plug it all the way in. also, uh, UPDATE UR BIOS!!!!!!!! when i first installed this psu, it wouldn't post, it just put all the fans at max and refused to power off with the power button. obviously also check if your connections are secure, that's important too, but the thing that fixed it for me was temporarily switching back to the old power supply to update the bios on the motherboard. for whatever reason, that made my computer function perfectly as intended on the other power supply. this might've been because my bios was really old at this point... (my bios was from 2021... ik it's bad, it's fixed now) also here's a quick but more detailed explanation of the knob, because corsair refuses to explain exactly how the fan knob works in any of the official documentation that's easily accessible from a quick google search or the qr code guide on the box!!!!!!! (see below for my complains about that lol) it basically functions like a weird dimmer switch. if you turn it all the way clockwise until it clicks, it goes to auto, basically the fans run based on sensor data and tries to be as quiet as possible. adjusting it to its other settings changes it to a more manual fan control, which is useful if you want to prioritize thermals more, or just want to dial it in more specifically. i could not find this clearly explained in any of the official material for the psu, so i wanted to share. if you've got this psu and the fans are constantly super loud, try turning the knob counterclockwise, either to a lower setting or to the auto/quiet setting. last small thing, i hate that this power supply doesn't have a quickstart guide in the box. especially when the online guide is extremely basic and doesn't explain one of its unique features for some inane reason???? it's small but it's honestly EXTREMELY disappointing to see. if you won't have internet access as you install the psu, you might have a really frustrating time finding information, as the only included documentation is basic specs on the box and a safety manual. otherwise, i can't really give *that* thorough of a review. go read an actual review if you wanna know if you should buy this or not for your system. (this applies to all power supplies tbh) in addition to the specs you can get from the manufacturer, it can be helpful to see if the efficiency & noise levels are acceptable for you, and it can be a nice reassurance to go see how well the safety features function in third-party tests. basically all power supplies with the right basic features will function just fine as long as you avoid the few products that have been shown to have consistent issues. most of them are manufactured by the same couple of companies and work just fine. the only thing you might want to seriously consider is avoiding companies with a habit of being shitty about warranties. (just for reference, right now the main culprit for this seems to be asus, they've been reguarly screwing people who try to warranty things.)
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Reviewed in the United States on May 14, 2025 by Ryan Stallings
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.
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Reviewed in the United States on May 31, 2025 by Marlena
Style: RMx (2024) - ATX 3.1
Size: 750W
I used this Corsair on a makeshift Plex Server build which is full of repurposed older parts, there was previously a 15 year old power supply in this case which needed to be upgraded so I picked 750w model for Corsair's reputation and it's power efficiency. The PSU is very silent, dead quiet because the fans don't run when it's at low usage. This Plex server build is only pulling approximately 80W under normal usage with the Corsair. On the ancient 15 year old power supply it was pulling approximately 120W under the same usage, so this Corsair power supply is giving me a 40W savings due to it's increased efficiency which is awesome. The build quality feels excellent and the cables provided are high quality and flexible making them easy to work with and route within the case. If you want to get fancy you could upgrade the cables to something like Cablemod cables but for my use with this Plex server it is not necessary as this wasn't meant to be a "pretty" build. This is my second Corsair power supply, I also have another model in my main system which has been running for a couple years without any issues. Most of Corsair's power supplies are on the high end of the PSU Tier list, google the PSU Tier List if you want to see it's exact rating among all other power supplies.
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Reviewed in the United States on May 13, 2025 by zerokarma zerokarma