Corsair RM Series RM850X 2021 850W Power Supply

Very good Corsair PSU. Full modular helps a lot, cable routing is a little harder considering some of the cables have a very hard rubberized section close to their end and that makes it difficult to maneuver around tight spaces on a smaller case. So far, happy with the purchase. Very good Corsair PSU. Full modular helps a lot, cable routing is a little harder considering some of the cables have a very hard rubberized section close to their end and that makes it difficult to maneuver around tight spaces on a smaller case. So far, happy with the purchase.

Provides plenty of power for my new build and seems stable enough Provides plenty of power for my new build and seems stable enough

Great PSU the newer ATX3.1 version to eliminate some of the fears around cable melting in newer GPUs such as the 5080 in my build. Did a lot of research in picking parts, reading alot of reviews and benchmarks this is more than adequate to power my system, had great safety ratings all with enough headroom for future upgrades. Also, the cable combs helped keep alot the wiring clean in my build Great PSU the newer ATX3.1 version to eliminate some of the fears around cable melting in newer GPUs such as the 5080 in my build. Did a lot of research in picking parts, reading alot of reviews and benchmarks this is more than adequate to power my system, had great safety ratings all with enough headroom for future upgrades. Also, the cable combs helped keep alot the wiring clean in my build

Reasonable pricing . Sufficient power and has fan speed controller. Reasonable pricing . Sufficient power and has fan speed controller.

It works, what more can I say. Its a power supply and its supplying power to my components. I know nothing more than that. It works, what more can I say. Its a power supply and its supplying power to my components. I know nothing more than that.

Does what it says on the box, and does it nice and quietly. The cables it came with were plentiful, had good length, and seem to be of good quality - no problems at all. Delivery was fast.

All up, if I needed another one I'd be buying another one of these. Does what it says on the box, and does it nice and quietly. The cables it came with were plentiful, had good length, and seem to be of good quality - no problems at all. Delivery was fast.

All up, if I needed another one I'd be buying another one of these.

More power than I need but issue free quiet performance More power than I need but issue free quiet performance

By: Tim_robinI 14/06/25

Verified Owner

this psu can get the job done but the coil whine makes it horrible to be next too, its a shame as this is a pretty expensive power supply for 850 watts i assumed it would do better this psu can get the job done but the coil whine makes it horrible to be next too, its a shame as this is a pretty expensive power supply for 850 watts i assumed it would do better

Has the full assortment of cables and runs very quiet. Has the full assortment of cables and runs very quiet.

The included cables look good and comes with pre-installed cable combs. They're also flexible which helps with cable management. It also comes with some zip ties.

The default hybrid fan mode works well and the PSU is extremely quiet. In hybrid mode, the PSU can get quite warm/hot with the fan turned off and orientated to the bottom of the case since there's no open ventilation for the heat to rise and escape. The knob is very useful to manually adjust the fan. I've kept it low enough where I can't hear the PSU fan over the other case fans/AIO/GPU while still feeling a good amount of ventilation being pushed through the PSU.

I spent a bi...view more The included cables look good and comes with pre-installed cable combs. They're also flexible which helps with cable management. It also comes with some zip ties.

The default hybrid fan mode works well and the PSU is extremely quiet. In hybrid mode, the PSU can get quite warm/hot with the fan turned off and orientated to the bottom of the case since there's no open ventilation for the heat to rise and escape. The knob is very useful to manually adjust the fan. I've kept it low enough where I can't hear the PSU fan over the other case fans/AIO/GPU while still feeling a good amount of ventilation being pushed through the PSU.

I spent a bit of time researching what 850W PSU to get, and this one was up there. It has all the usual protections and the efficiency is strong for the 80+ gold standard. The 10-year warranty is icing on the cake.

Good product, quiet and easy to install. Good product, quiet and easy to install.

No issues lots of cables quiet works well happy No issues lots of cables quiet works well happy