Amazon.com: Customer reviews: CORSAIR RMX Series, RM850x, 850 Watt, 80+ Gold Certified, Fully Modular Power Supply

Top positive review

I know Corsair for its quality and good customer support. This yet another good product from them.

Reviewed in the United States on December 25, 2022

Purchased on: November 29, 2016 and reviewed as of January 17, 2023.

I have had this power supply for a few years already and I have never had a single issue with it.

It is quiet and works very well. It includes plenty of cables that should cover all of your needs.

I recently decided to upgrade to a new HX1000i because I am confident in Corsair's quality and I need a new power supply for my 4090. Highly recommended from my personal experience.

Unfortunately, I don't have the knowledge to go into technical details for the power supply so I can only share my average end user experience.

One person found this helpful

Top critical review

Critical reviews›

Amazon Customer

Good PSU depend on the location on the case.

Reviewed in the United States on April 27, 2017

The PSU works, power up with dual e5-4660 v3, Asrock Rack ep2c612 ws.
I reuse the old tower case where the PSU is located on top of the case, above HDD housing.
The only issues is the FAN will not spin under normal use. This create major problem (negative pressure), the front case fan will pull cool air from the back of the PSU then travel thru the case out of the front. The HDD below the PSU has higher than normal temperature.

I would suggest Corsair to modify the PSU to allow user select "quite fan" or minimum always ON fan function by adding a switch on the side of the PSU.

I will modify the PSU by replace a 140mm PWM fan and connect to the motherboard.

526 total ratings, 252 with reviews

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From the United States

I know Corsair for its quality and good customer support. This yet another good product from them.

Reviewed in the United States on December 25, 2022

Verified Purchase

One person found this helpful

Helpful

Cory Hanson

Efficient, quiet, and more than enough.

Reviewed in the United States on September 7, 2017

Verified Purchase

This power supply is probably overkill for me but I wanted a power supply that was completely silent and that will last me through any future upgrade. I never reach loads high enough with the components in my system that the power supply's fan will even spin up and create unwanted noise like my last one. This is one of the highest rated efficient power supplies out there when I bought it, besides the RM1000x, of course. The price seems to fluctuate and balloon ridiculously high often with each of these models. I bought this at around $100, and when I posted this it is up to $150. The RM100x I have seen at $120, now it is somewhere around $175. I can only assume this is because they are in such high demand because of their 'legendary' efficiency ratings by some guy with a website I forgot its name that does all of the testing on power supplies... anyway.

It is powering the following and the the fan never spins up besides at boot:

AMD Ryzen 1700 OC'ed to 3.9 GHz
Asus Prime B350-Plus
Nvidia GeForce GTX 970
Corsair 3000MHz RAM 2x 8 GB
Corsair H100i v2
1 SSD
3 HDD

It will run your stuff and it is super quiet.

One person found this helpful

Helpful

850w Plenty of juice for any high-end build

Reviewed in the United States on May 16, 2017

Verified Purchase

Corsair power supplies are good and worth the money you spend. They are packaged nicely come in a velvet pouch and your cables are in a separate bag too so you can store the ones you do not use. I use Corsairs in all my builds. The 850w is a nice sweet spot. Plenty of power for dual graphics adapters if you choose, as well as, powering the latest CPU's,LED Ram kits, RGB case lighting etc. etc. Very clean and quiet. I am a HAM radio operator and the last thing I need to hear is a whiny power supply using bad components coming in on my receive. No issues ever with Corsair, they are quality units.

2 people found this helpful

Helpful

SWP

Excellent power delivery at a very quiet level

Reviewed in the United States on March 28, 2017

Verified Purchase

Love it! Its power delivery is extremely quiet. Compared to my old PSU, this one is near silent. The packaging for this product was excellent, and even came with a nice carrying bag for the extra cables. The only nitpick I have is the SATA power cables. The wires supplying power are rather thick, and as such, don't lay quite as flat as I'd like them to. I had to move my SSD drivers further back to stop the cable from resting on the bottom of the enclosure and causing the plug to have some pressure on it. Corsair, either move the wires to the back of the plug, or make the wires a bit more malleable.

Helpful

theacefes

This was super easy to install and the difference in noise output ...

Reviewed in the United States on April 11, 2017

Verified Purchase

Upgraded from a 600W Rosewill that I'd had since 2012. Running i7 with 980Ti VR Edition. This was super easy to install and the difference in noise output is incredible. My computer no longer sounds like it wants to eat my 9 pound dog. Games and VR (Vive) run wonderfully. Comes with a nice box and a supply bag to keep the cables you don't need. The modular cable approach is great because it helps prevent the explosion of wire that typically happens unless you're a genie at cable management. Also came with a sticker to put on the case!

Helpful

Thad

Great PSU

Reviewed in the United States on July 15, 2016

Verified Purchase

A bit overkill but it was the same price for a 750 watt, so I was just like... whatever. Great modular PSU. I trust Corsair in this regard. The only place it loses its star is in the wall adapter. When I was building, it just didn't feel like it was plugging into the pc securely. In fact it was a bit loose. After I was done building and put the PC where it actually lived, I had do make sure the cable was tightly curved so it wouldn't wiggle in the socket. This same thing happened with a work PC in my office. We ended up switching a to a different cable to plug it into the wall that was much more secure and a tighter fit. I may call Corsair and ask if they have a solution to this... The computer is getting power though. It works.

3 people found this helpful

Helpful

Andrienko Sergey

That's worked well

Reviewed in the United States on January 13, 2024

Verified Purchase

RM850x = good
Corsair CX Series 750 = very bad cuz burned out

Helpful

Dave Smith

I previously owned the extremely nice version of the corsair psu i think the ax860i

Reviewed in the United States on May 27, 2016

Verified Purchase

im not building my new computer till mid june (when gtx 1070 comes out) but i couldnt pass up on the 110 dollar sale, ive done alot of research on psu's so im posting this review early just to inform people. I previously owned the extremely nice version of the corsair psu i think the ax860i, but ever since i installed this and a new gpu my computer has been having issues, i couldnt ever find out if its due to the psu but after doing a bunch of searching i found out that the ax one i had was the very first iteration of incorporating digital feed back in a psu - im here to tell you thats not needed, which is why i didnt go with the rm (digital one forgot exactly which it is) - basically it says that if a product doesnt need that much power it wont send it the power (this one on the other hand is completely analog (right term?) and it will send a constant power signal to all you products with no fluctuation - if you plan on upgrading soon, unless u do this for ur business and/or have a multimeter for measuring wattage, i would 100% say go with a non digital psu - i love the quality control and customer service and all corsair products ive owned in the past so it was a no brainer to chose from corsair - ive always liked over buyign for future builds too and this one should do it, everything is taking less power these days so even if i had to run a 1070 in sli i could ( i never will though im a believer in a single gpu), i did want all moddular....so this one took the cake, oh and a manufacture date from 2016 is always nice (product released like a month ago)
as i said i havent used it yet but i have the ax860i so i suspect this will work with flying colors as all corsair products do

sorry for the garbled typing but i wanted to record my thoughts as i was thinking about this

2 people found this helpful

Helpful

The Awesome "K"

Nice but need to include more cables - and be sure to confirm which version you're ordering.

Reviewed in the United States on January 26, 2018

Verified Purchase

So far working well, but these come with only 3 PCIe cables - a huge shortcoming if you're setting up mining rigs and need 1 PCIe per GPU. Had to order additional cables which is irritating considering how many modular ports these come with. Why don't they just include enough cables to start with? The EVGA 750w's I got all came with 4 PCIe each (but they were out so I've switched to these). I am saving some watts using the larger PSUs, too - they're more efficient when you're not at 95% capacity as I was before.

Also be SURE to notice if the RMx or TX version (or other) is highlighted when you click the Add to Cart button. I ended up with the TX versions the first go around and had to return them all as they don't have nearly enough connectors.

3 people found this helpful

Helpful

Christian D. Schofield

Silent and Awesome Power Supply

Reviewed in the United States on September 18, 2016

Verified Purchase

I bought another pc and moved my GTX970 into it. I had put a cheap Chinese 650W power supply in it. Under normal use everything was fine, but when I went play games, the speakers would buzz, and the buzzing wasn't tied to the volume of the speakers. Even with the speakers on MUTE it would buzz. I tried several things and then became convinced it was the cheap components of the power supply causing it. I purchased this Corsair and not only is there absolutely no noise while gaming, there's virtually no noise at all from the power supply. Corsair packs it well and the modulars cables come in a nylon bag! It was easy to install and route the wires. The flat wires on the Sata connections are awesome for routing!

33 people found this helpful

Helpful

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