Customer Ratings & Reviews

The Corsair RM850x is an outstanding power supply. It’s extremely reliable, runs quietly even under load, and delivers stable power with no issues. The fully modular design made cable management easy, and build quality feels top-tier. It’s efficient, dependable, and perfect for high-end gaming or workstation builds. Corsair really nailed it with this PSU—highly recommended.

The CORSAIR RM850x is a rock-solid power supply! It’s quiet, reliable, and provides plenty of power for my setup with room to spare. Installation was simple, and the fully modular cables make cable management a breeze. With excellent efficiency and build quality, this PSU is a great choice for anyone looking for a dependable upgrade.

This power supply is quiet, and handles all my components without issues. Dedicated 12vhighpower or 12v 2x6 connector. Powers a 4090/9800X3D, many rgb fans and a 420mm aio without a problems. A bit on the expensive side for 850watts, but you get what you pay for.

Bought this as i was upgrading my graphics card and is more than what i need. Being fully modular helped tremendously with cable management and never hear the fan spinning.

Not sure what else I can add that hasn't been said 10000x about Corsair RMx PSUs. Silent operation. Nice cables. Easy to plug in. Powers all my stuff. Native 12VHPWR. Best bang for buck re: PSUs for a long time now.

Easy to Install, comes with more than enough cables; low powet mode knob highly useful.

easy install, plenty of extra cables fast to set up. have one like this in all of my machines

Exactly what I needed. Super quiet and super reliable.

I’ve purchased multiple variations of this product over time, and the experience has been consistently excellent. Build quality is solid, performance is reliable, and it does exactly what it’s supposed to do without surprises. Installation is straightforward, fit and finish are clean, and it performs well under sustained use. What ultimately keeps me buying this is consistency. Across different models and configurations, the quality has remained dependable, which matters more than flashy features. When I need something I can trust, this is the brand I reach for, and it hasn’t let me down yet. I wouldn’t hesitate to purchase this again, and I routinely recommend it to others who want reliable hardware without headaches.

works great. its been quiet, no hicups on power delivery, no issues at all. there are cheaper psu out there, but this one is highly rated and should last you for years provided you dont need more power down the road.

Very nice power supply. good quality materials. the supplied power cables feel very nice and stiff while still being flexible to route in the case. the psu is very quiet during idle and during load, and it also has an option to manually and physically control the fan speed. 10/10 would recommend

Been great so far, very easy to set up with high quality and organized cabling. My favorite part is that it comes in eco-friendly packaging with no plastic! If anything thats just nice when throwing it away because mountains of hard plastic are a pain in the booty with other products.

I was in need of a new PSU, so I chose the RM850x because I read what was in it as well as the overall ratings it had. The PSU performs beautifully and exceeded my expectations. My system looks much cleaner now too. The previous faulty PSU had multi colored cables that stuck out like a soar thumb, now the cables look significantly nice in my system and they blend well. Also came with a 12vhp cable and port, not that I am using it since my GPU doesn't require it, but it's nice to know that I have that option if I upgrade to something that needs it in the future.

Easy to install and the cables have a nice look. Wish it had a second PCIE cable though…

I bought this for my first build. 9800x3D, 9070XT and it is working just fine. No issues so far after a few weeks. Runs silent and keeps giving power

Not much to say, bought it cause my old PSU died right before closing time. Raced over, picked it up, and slapped it in! Works like a charm. Has a interesting manual fan speed knob on it so you can crank it up or just leave it off for auto speed.

Easy install, great so far no complaints. I’m a big fan of Corsair and have always had a good history with their products

I recently upgraded to the Corsair RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply, and it has been an excellent choice for my system. One of the key reasons for upgrading was to support my new Nvidia GPU, and this PSU delivers flawlessly, especially with the built-in 12VHPWR connector, eliminating the need for adapters. The adjustable fan in the back is a great feature, allowing for better cooling control and quieter operation under different loads. The fully modular design made installation and cable management a breeze, keeping my setup clean and efficient.

Graeat PSU with out all the unnecessary wires. Gives you more options in building your Rig. No issues with power so far.

I generally have never had any problem with Corsair products. This power supply replaced my mothers from 2012. Yeah 2012. They're generally only supposed to last 7 to maybe 10 years and that thing was over 13 years old. Well her original power supply which was an ATX one from like 2011 or 12 and I think it was still okay but it was just so old that when I put my computer parts in it from 8 years ago it demanded more power and I didn't want to have it. Underpowered so I got her about 100 maybe 200 w more than she needed just in case he needs more power later on. Overall Corsair products are great products until you need customer service. I bought a power supply a 1200 w one and it's supposed to come with two pcie cables for the graphic cards. For some reason it was a mistake in the box and it was only one in there and most gpus nowadays are so overpowered to use three plugs back in the day. Corsair used to give you more than what you needed back in the day they used to use two, so they'd give you like four or even five. This one didn't even give you enough for a High-End graphic card which uses three plugs. The mid-range ones use two so you know you always got to give a spare even when you're buying a piece of furniture. They always give you at least one or two extra screws in case one of them gets stripped or they break and you know and then they give you dual PCI Express adapters which can become unstable and where two plugs plug into one power unit and it's just not a safe thing to use. Most of the friends that I have never use those cuz they say they can be unstable they can heat up. One said they had theirs melt. It's just not safe. You need three separate pcie cables, not two combined into one so I said why did you even include those? If you're going to include one and give us extra pcie cables, it took them over a month. Numerous mistakes. Then they sent me four PCIE dual cables and I'm like that's not what I asked for. In fact I said specifically don't send me these for one reason or another and that's what they did the first time and it wasn't even the ones that came in my power supply after are going back and forth with them for over a month. I said look send me exactly the same type the flat pcie cables separate ones not dual the exact same ones that come with my power supply do not deviate from it. Donami send me braided one send me the exact same ones that came at my power supply with the exact same part numbers that are on the cables and after over a month of arguing back and forth they finally sent me the correct cables and four of them. That's my only reason. Wife of four star is out of five. You know if you don't have any problems with the products which I think 90 to 95% of the time you won't and there's no issues then you generally don't have to worry about their product cuz I have some quality products there. Just make sure that when you're buying a power supply you buy a little leeway in case you get more energy demanding parts like gpus. So if you think you need a thousand get 1200 if you think you need $750, then get a 850 or $1,000. Always get a little more than what you need for a little leeway just in case and that's what I've always done since 1999. The price was good also on this product because it was on sale and it was less expensive than going to a competitor. So the timing was perfect that this was on sale cuz she needed it. Hers was so old I wasn't going to take a chance on it even if it did last another couple of years. It was well past its prime so I got her on new modular one so I didn't need all the extra cables that the old one had. That's how old it was