Customer Ratings & Reviews

One of the best, most powerful power supplies I've installed recently. Fully modular with a generous cable array and a silent fan for unending quiet operation.

Upgrading a bit from a 750-watt Gold.. this brand has always been reliable and fantastic. I can't even tell this thing is on but it does it's job exactly as expected. Great power supply.

I was having issues with my power supply so i got this new one and ong the difference is unreal, can’t believe i didnt upgrade soon. The 850w also leaves me room to upgrade to a new gpu. My pc has a ton of rgb and this power supply just thanks it. Tons of cables I accidentally messed uo the connection once tho but thats on me. If youare reading this and are 2nd guessing please don’t get it, trust me you will not regret it

Easy install process, worked great to power my entire system hasn't given me even one problem in almost a year of daily use

Reliable, affordable, quiet. Great Choice and overall probably the best in its class.

Great power supply, very quiet and modular so no extra cables you dont need cluttering up your case. Plenty of power for now.

Wanted this PSU for the Corsair brand reliability, and 850watts would probably last me forever in terms of Future proofing with PC upgrades. Bought a month ago from this review, no issues as far as I can tell, also the fully modular design makes cable management so much cleaner inside your PC.

I had a 750 that was not handling my current set up. Ran to the nearest best buy and the guy that helped me picked out this PAU based on the gear that I listed. Have had it for almost a year. Still kicking butt and should handle my new 4070 just fine!

The Corsair RM850x is an outstanding power supply that delivers consistent, reliable power while staying very quiet. Build quality is excellent, and the fully modular cables make cable management simple and clean. It easily handles demanding systems with high-end graphics cards and CPUs, providing peace of mind during heavy gaming or workloads. This PSU is efficient, dependable, and well worth the investment for a long-term build.

Modular power supplies make life so much easier and Corsair takes that to the next level. The cable lengths are solid and the mesh wrapping around the all-black cables makes it simple to get your build looking clean. Also, I've been monitoring how stable the voltages going into my VRMs are and this PSU is rock-solid. The fan is also extremely quiet.

Corsair RMX850 power supply: The Corsair RMX850 is an excellent power supply that provides a maximum power output of 850 watts. It is designed to meet the high demands of gaming PCs and other high-performance systems. It boasts an 80+ Gold certification, which means that it operates at an impressive efficiency of 90%, ensuring that it operates without generating too much heat or causing unnecessary waste of electricity. This power supply also features fully modular cable management, which is a great feature that helps to keep cables at bay and make your build look neat and organised. It also allows you to use only the cables you need for your system, helping to reduce clutter and cable mess. The RMX850 also has a quiet and intelligent fan system that adjusts its speed depending on system load and temperature, to ensure quiet operation and maintain optimal performance even under heavy loads. Overall, the Corsair RMX850 is an excellent choice for gamers and PC enthusiasts in need of a high-quality power supply that will keep their system running smoothly and reliably. It is efficient, quiet, and made with high-quality components, making it definitely worth the investment.

I needed a new power supply for my new build and had great experience with Corsair in the past. Definitely recommend a fully modular power supply as it just makes it easy to only install the cables you need. 850w is more than enoigh power for my setup, which includes a 3080 GPU, 13600K CPU, and DDR5 memory. It should alos provide enough headroom for expandability if I need it.

Had to upgrade from 600w to this. Recently got a 3070 so this was an essential. Really cool because you can plug in the wires that you only need instead of having 800 wires coming out at once from other brands. Would recommend Corsair when is comes to PS. Some of the wiring is a bit thick so it was a little complicated when it comes to cable management but it’s not impossible.

Excellent power supply. This is the second one I have bought and was just as easy as the first to install. Good selection of modular cables and according to monitoring software the 12 5 and 3.3 volt rails are all within a percentage of the target

So far so good. Easy to set up. The instructions are weak and the labels as to what goes to each module cord is weak (the Thermaltake I have was MUCH better labeled and it is so simple to do), but I figured it out. It seems to work well. Quiet. I read multiple reviews and this always came out in the top 3.

Very easy to install, and it is very quiet during cooling cycles. Corsair has done a great job with their modular power supplies. Everything you need (...especially cables) are included in the package.

Swapped out a faulty 1000w psu I got off of Amazon for this one and it has literally been plug in and forget. This thing is so reliable is ridiculous. Super streamlined setup. Zero problems whatsoever.

Great power supply for anyone either building a pc and or upgrading their old one I myself stream on duel monitors which forces me to have multiple programs open and a game which can make your pc run slower but with this power supple everything runs smooth a glass.

It's a really good power supply. Has all the cables I need. It doesn't hog up a lot of room. Fully modular is a big plus. That in itself helped me run cables through holes I couldn't before.

Being a Corsair fan for many years, I was not disappointed with this fully modular GOLD rated power supply. Being able to power the basic motherboard is nothing special, but, being able to supply the plus 4, plus 8, plus 12 ports for the cpu makes this power supply exceptional. This psu does NOT have RGB fan lighting, but being 90% efficient and zero RPM capable makes up for it!