Modern Standby is an upcoming feature for Windows 10 that vastly improves your PC's sleep and wake functionality. The technology allows your system to wake from sleep more than twice as fast, as well as maintain a network connection during sleep to continue downloading updates and receive emails and notifications - just like your phone. Best of all, it does this with less overall power consumption. The RM Series delivers power at up to 90% efficiency, lowering energy consumption, noise, temperatures, and your power bill. Using industrial-grade electrolytic capacitors, RM Series power supplies offer the unwavering power and long-term reliability you demand from a CORSAIR power supply. The RM Series' cooling fan doesn't spin until you need it, for near-silent operation at low and medium loads. A 135mm rifle bearing fan with a specially calculated fan curve ensures that fan noise is kept to a minimum, even at full load. When at low and medium loads, the fan stops spinning entirely until it's needed, resulting in virtually silent operation.
Modern Standby is an upcoming feature for Windows 10 that vastly improves your PC's sleep and wake functionality. The technology allows your system to wake from sleep more than twice as fast, as well as maintain a network connection during sleep to continue downloading updates and receive emails and notifications - just like your phone. Best of all, it does this with less overall power consumption. The RM Series delivers power at up to 90% efficiency, lowering energy consumption, noise, temperatures, and your power bill. Using industrial-grade electrolytic capacitors, RM Series power supplies offer the unwavering power and long-term reliability you demand from a CORSAIR power supply. The RM Series' cooling fan doesn't spin until you need it, for near-silent operation at low and medium loads. A 135mm rifle bearing fan with a specially calculated fan curve ensures that fan noise is kept to a minimum, even at full load. When at low and medium loads, the fan stops spinning entirely until it's needed, resulting in virtually silent operation.
in 2 offers
last seen 2 Sept 2026
The lowest price we last saw for Corsair RM Series RM850 - 850 Watt 80 Plus Gold Fully Modular ATX PSU was $195.94 at Ink and Rolls, compared across 2 retailers (last seen 2 Sept 2026). Prices may have changed since.
The all-time low we recorded was $169.00 on 10 May 2026.
Prices last updated 2 Sept 2026.
Corsair RM Series RM850 - 850 Watt 80 Plus Gold Fully Modular ATX PSU
Modern Standby is an upcoming feature for Windows 10 that vastly improves your PC's sleep and wake functionality. The technology allows your system to wake from sleep more than twice as fast, as well as maintain a network connection during sleep to continue downloading updates and receive emails and notifications - just like your phone. Best of all, it does this with less overall power consumption. The RM Series delivers power at up to 90% efficiency, lowering energy consumption, noise, temperatures, and your power bill. Using industrial-grade electrolytic capacitors, RM Series power supplies offer the unwavering power and long-term reliability you demand from a CORSAIR power supply. The RM Series' cooling fan doesn't spin until you need it, for near-silent operation at low and medium loads. A 135mm rifle bearing fan with a specially calculated fan curve ensures that fan noise is kept to a minimum, even at full load. When at low and medium loads, the fan stops spinning entirely until it's needed, resulting in virtually silent operation.
Modern Standby is an upcoming feature for Windows 10 that vastly improves your PC's sleep and wake functionality. The technology allows your system to wake from sleep more than twice as fast, as well as maintain a network connection during sleep to continue downloading updates and receive emails and notifications - just like your phone. Best of all, it does this with less overall power consumption. The RM Series delivers power at up to 90% efficiency, lowering energy consumption, noise, temperatures, and your power bill. Using industrial-grade electrolytic capacitors, RM Series power supplies offer the unwavering power and long-term reliability you demand from a CORSAIR power supply. The RM Series' cooling fan doesn't spin until you need it, for near-silent operation at low and medium loads. A 135mm rifle bearing fan with a specially calculated fan curve ensures that fan noise is kept to a minimum, even at full load. When at low and medium loads, the fan stops spinning entirely until it's needed, resulting in virtually silent operation.
Last updated at 02/09/2026 05:00:19
COR PSU 850W-CMPSU-RM850E-BLK
Delivery between 7–15 Sept $15
Corsair 850W 2021 RM 80+ Gold Fully Modular 140mm, 12PIN GPU, FAN ATX Power Supply, PSU, 10 Years Warranty (LS)
originally posted on cclonline.com
best value modular power supply you can get in my opinion, comfortably powering my 12700k and 3080ti, corsair even offer a dedicated 12pin psu cable (extra on website) which cleans up the build and of course plugs straight in.psu is pretty much silent and stays cool, always ran corsair psus and glad I chose this one.
originally posted on cclonline.com
Easy site to purchase from and the part arrived in good time in perfect condition ;) Had a lot of fun installing it as the cabled that came with it were very easy to use to keep my tower looking amazing and hiding the cables was easy and also my first time ;) Great upgrade for my system which is now all corsair where it counts , Many thanks to CCL computers
originally posted on cclonline.com
A PSU is something you should not scrimp on, and this Corsair provides surplus power capacity for me at the moment, with a number of rails, excellent connectivity and at a good price too.
| Length | 160mm |
| LED Lighting | No |
| Fanless | No |
| Energy Efficiency | 80 PLUS Gold |
COR PSU 850W-CMPSU-RM850E-BLK
Delivery between 7–15 Sept $15
Corsair 850W 2021 RM 80+ Gold Fully Modular 140mm, 12PIN GPU, FAN ATX Power Supply, PSU, 10 Years Warranty (LS)
best value modular power supply you can get in my opinion, comfortably powering my 12700k and 3080ti, corsair even offer a dedicated 12pin psu cable (extra on website) which cleans up the build and of course plugs straight in.psu is pretty much silent and stays cool, always ran corsair psus and glad I chose this one.
Easy site to purchase from and the part arrived in good time in perfect condition ;) Had a lot of fun installing it as the cabled that came with it were very easy to use to keep my tower looking amazing and hiding the cables was easy and also my first time ;) Great upgrade for my system which is now all corsair where it counts , Many thanks to CCL computers
A PSU is something you should not scrimp on, and this Corsair provides surplus power capacity for me at the moment, with a number of rails, excellent connectivity and at a good price too.
You get what you pay for. Silent. Bulletproof. Tbh on my system, it idles a lot of the time with no fan activity. I attribute this to a) North of England optimal ambient temperature (for computers, not humans) and b) Rock solid design and quality hardware, I've 4 of these in various office computers 24/7. Never had an issue.
Very good, never makes sound due to its 0 RPM fan mode. Got this to replace my 600W PSU but it was actually an unnecessary upgrade that I slightly regret, so be sure to double check whether you need such power. Anyway, quality and price for the power is one of the best, plus it's a very recent product refresh.
Absolutely 💯 happy with this corsair power pack definitely recomend the moduler power over the fixed one saves loads of space for pc build and the quality is amazing well worth the price in my opinion 😀
Pros: Received quickly and in perfect condition.Easy to install and replace old PSU
Very good and quiet power supply. Has no problems powering everything including a 3080, i5-12600k and lots of RGB.If I was to pick one thing I would have liked, it would be more stylish power cables. The PCI cables all have additional cables so you can run multiple items of one power cable but for the graphics I don't need this and would rather not have to tuck them out of the way.The fully modular design is great allowing you to only put the cables you actually need so keeps everything a little bit cleaner.
Pros: One of the best PSU's on the market for the range of Wattage. Cables are well designed too with plenty of length.
Pros: Really quiet, coming with white cables to match is a big bonus and overall fit exactly as it should doCons: Could include more PCiE cables that don’t have daisy chains on just a straight cable other than it’s brilliant
| Length | 160mm |
| LED Lighting | No |
| Fanless | No |
| Energy Efficiency | 80 PLUS Gold |
