Customer Ratings & Reviews

Can’t go wrong with the RMx series from Corsair. High quality PSU.

Absolutely amazing power supply does exactly what it's meant to do. Good futureproofing.

Works well, glad they had it in stock and was able get my pc up and running

Exactly what I needed to build a solid budget gaming PC!

Great PSU, comes with all attachments, highly recommend

Have had other Corsair power supplies that have lasted. This new RM850x 2024 ATX3.1 model is questionable. The new cables are nice and thin for easy management, but some of the connector do not seat easily/properly. With new RTX50 series already melting down with nvidia saying improperly seated cables this one leaves me questioning if I should keep it. Still debating on returning.

Better get this if you’re building new pc that has many fans and higher specs!

Bit of an oddity with this one. I think it's a model issue. The standby power for sleep or turn on from Windows shutdown does not hold enough power to boot the machine. Replaced it with the exact same model and the same issue occurs. The only way to remedy it is to turn the power supply off and on. Old PSU behaved normally. I am using an AM4 board so perhaps there is something to do with it there but odd none the less.

Plugged in easy and runs nice, my setup is great, 10/10

Great item and great price! will fit my build perfect

I have tried two of these units with my asrock taichi x99 motherboard. My system works perfect with my hx750i. I have tried everything I know to get it to work. I will have to spend more to get a single rail design. I'm sure it works amazing on other systems. Just not mine for some in depth reason.

Devices work as intended, came in quickly, pickup was easy

I purchased this while building my new pc and this ended up being broken. And was causing problems for my pc.

Any time you pc is at idle, this PSU makes a terrible coil whine sound, loud enough to hear it the next room.

I bought it, but it wasn’t installed until three weeks later, and the unit didn’t turn on. They tested it, and it was dead. It took me another week to take it to the Best Buy store, and they told me I had 30 days to return it or exchange it, but it had already been 32 days, so I couldn’t return it. It turned out to be defective, and I lost my money.

The PSU does not come with a user manual or spare cable bag (PSU, cables, 4 screws, Zip-ties and Safety Disclaimer). When I installed the RM850e and turned on my spare PC the GPU (560ti) emitted a very loud coil whine that sounded just like a telegraph machine from five feet away. The GPU's 12V coils could barely handle the massive 12V rail ripple coming from the PSU. The motherboard (MSI 890FXA-GD70) LED code started to flicker on and off. I pulled the plug and tried another functional GPU (GT740) and it was even worse. I reinstalled the old Corsair 550W PSU, now both GPU's have damaged volt pots and coil whine at idle. When I returned the PSU, Bestbuy accepted it and gave me store credit ($130.81). Avoid this PSU. Do not use it for "old" PC's that NO NOT meet ATX 3.1 power standards or it will damage your computer.

I've used Corsair power supplies for many, many years. The power cables with this one are TERRIBLE. Forces you to use a million zip ties. I have an older 850x that has normal power cables. Very disappointed in the new cable design.

After fighting to get this to work with my new nVidia rtx 5080 card, i found it wasnt giving me steady power to memory or cpu, even with my old 3070 card. Unfortunately i also find that im outside of Best Buys ridiculous 14 day return window. Last thing i buy from Best Buy. Industry standard is st least 30 days.

unit failed after 1 week replaced with the RM1000x instead

This was my first time replacing a PSU. The labels and organized packaging made it very intuitive for me and it works great!