Customer Ratings & Reviews

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

Nicely sleeved cables, very quiet under load and efficient

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

Works fine as far as I know/can tell, does randomly emit a loud buzzing noise thay is incredibly annoying and somewhat concerning. Ive used corsair psu's my whole life, and this was the first Ive had with this issue.

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

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

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.

Good PSU, but recently had issue with USB shutting down. Noticed that the PSU was way hotong than it should be. Got it back in April issues started after 5 months. 6 months it happened more often.

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

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.

Great item and great price! will fit my build perfect

Broke down within a 1.5 years. Definitely would not recommend. Buy something else.

Its is good power supply but its weekness is all the cables come with this unit is poor quality, my old motherboard is not supported

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’m giving this one star review not to the product but to Best Buy itself consistently calling me by name that isn’t my name when I’ve changed my name multiple times and yet you still call me by the wrong name. It’s a little disrespectful Best Buy. You need to do better I’m done buying from you.

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.

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.