Corsair CP-9020056-UK RM Series RM850 80 Plus Gold 850W ATX/EPS Fully Modular Power Supply Unit
We don't know when or if this item will be back in stock.
- Enter your model number above to make sure this fits.
- 850W PSU Optimized for Silence - Zero RPM Mode and custom designed fan.
- 80 PLUS Gold-certified Efficiency - Highly efficient RM Series power supplies produce less heat and have lower operating costs.
- Flat black, Low-Profile Modular Cables- You can use only the cables you need, and leave the rest in the box for fast, easy, and great-looking builds.
- Reliable, Continuous Power Delivery
- Corsair Link Compatible - Want even more? RM Series power supplies connect to Corsair Link software for real-time monitoring of fan speed and power delivery directly from your desktop (Additional hardware required for 450W-850W units. See corsair.com for more details)
There is a newer model of this item:
Customers Who Bought This Item Also Bought
Corsair RM Series power supplies are fully modular and optimized for silence and high efficiency. Zero RPM Fan Mode means that the fan doesn't even spin until the power supply is under heavy load, and the fan is custom-designed for low noise operation even at high loads. 80 PLUS Gold rated efficiency saves you money on your power bill, and the flat black cables are fully modular, so you can enjoy fast, neat builds. And, like all Corsair power supplies, RM Series is built with high-quality components and is guaranteed to deliver clean, stable, continuous power. Connect it to your Corsair Link system and you can even monitor fan speed and +12V current directly from your desktop (additional cable required for 450W-850W units).
13 Cables;Motherboard cable (20+4 pin) x 1, length 610mm;4+4-pin (CPU, works as either 4 or 8-pin) x 2, Length 650mm;PCIe 6+2 pin (GPU) x 6, Length 750mm;4-pin Peripheral power connector x 8;SATA 5-pin connector x 10;Floppy power x 2; RM Series 850W Power Supply
From the Manufacturer
Reliable Operation, Fully Modular Cabling and Optimised for Silence.
The Corsair RM850 is fully modular and optimised for silence and high efficiency. It’s built with low-noise capacitors and transformers and Zero RPM Fan Mode ensures that the fan doesn’t even spin until the power supply is under heavy load. And with a fan that’s custom-designed for low noise operation, it’s whisper-quiet even when it’s pushed hard.
80 PLUS Gold rated efficiency saves you money on your power bill and the low-profile black cables are fully modular, so you can enjoy fast, neat builds. And, like all Corsair power supplies, the RM850 is built with high-quality components and delivers clean, stable, continuous power. Want even more? Connect it to your Corsair Link system (available separately) and you can even monitor fan speed and +12 V current directly from your desktop.
High-Quality, Low-Noise Capacitors and Transformers
RM Series power supplies are designed with capacitors and transformers carefully selected to eliminate coil whine and other background noise that can be annoying in quiet environments.
Zero RPM Fan Mode
The efficient design of the RM850 means minimal excess heat generation, so the fan doesn't even need to spin under low to medium loads. And when you're pushing it hard, the thermal sensor controls the fan speed to ensure that it gets the cooling it needs without any extra noise.
Corsair NR135L Noise-Reducing Fan
The custom-designed fan has an optimised blade profile for low-turbulence airflow and near-silent operation even at full speed.
80 PLUS Gold-Certified Efficiency
Highly efficient RM Series power supplies produce less heat.
Flat Black, Low-Profile Modular Cables
You can use only the cables you need and leave the rest in the box for fast, easy and ideal builds.
Reliable, Continuous Power Delivery
Power ratings are continuous, not peak, for protection for your valuable PC. Corsair uses high-quality internal components and the RM850 delivers clean, stable, continuous power.
Corsair Link Compatible
Want even more? RM Series power supplies connect to Corsair Link hubs (available separately) for real-time monitoring of fan speed and power delivery directly from your desktop.
- 80 PLUS Gold certified, delivering over 92 per cent energy efficiency at real world load conditions.
- The completely modular cable system allows you to use only the cables you need.
- Low-profile, flat cable design reduces air friction and helps maximise airflow through your computer’s chassis.
- High-quality capacitors provide uncompromised performance and reliability.
What do customers buy after viewing this item?
Top Customer Reviews
This is a solid improvement over my old PSU as it is now fully modular and is also 80+ Gold efficiency rated, my previous unit was only rated at 80+. Design and build quality is very good as with most Corsair power supplies. I'm most impressed with the 0RPM technology which means it's pretty much silent all the time. Even when the fan does ramp up it's impossible for me to hear it.
The cables are flat and are very similar to the ones found with Corsair's AX series PSU's. Some other reviews have mentioned that the cable connections are a bit stiff and I did find this to be true with the 24 pin ATX connector but all of the others were fine.
This didn't bother me much as it just needs a little extra force applied for it to click into place.
The C-link cables are included in the 1000 watt version but I did not use/test this out so I'm not sure how useful it is.
I'm very pleased with this PSU as it currently powers my high performance workstation/gaming rig and it's completely stable and very quite!
I've just purchased the 750w version of this unit from amazon based on the strengths of the 1000w version and I can confirm it's every bit as good.
The only negative I can mention is that you don't get the complete C-Link dongle with this one only the 1000w version.
There is a slight price premium for this unit over some of other 750w PSU's available but I will say it's worth it due to features like gold efficiency rating, full modular design and 0RPM technology.
This unit is worth every penny and exudes quality. 5 stars again.
If you are BUYING ONE OF THESE, LOOK at the batch number and contact CORSAIR and see if your PSU is not one from the faulty batch. AS YOU MAY HAVE A REALLY BIG ISSUE IN THE FUTURE, THE MODELS which were made during the 2013/4 were recalled because the COIL which is ment to detect the temps that enables the fan to spin to keep the parts cool does not start spinning because as the coil was placed behind the fan so the temps wouldnt reach the coil thus the fan never span which causes heat and from that causes you parts to fry.
I am very SUPRISED AMAZON still sell these and have NOT CONTACTED CORSAIR.
I can give some subjective opinions though. The PSU is absolutely silent, even with the fan on I simply can't hear it. A lot of PSUs claim to have 'quiet' fans and 'temperature controlled' fans; but this one really does do both wonderfully well. The regulation re. crosstalk also seems to be exceptional. With an EVGA PSU coil whine from the GPU would cause noise on my headphones using a SoundBlaster Z. With the Corsair PSU there is no noise at all - just clean crisp audio.
The 'i' part of the PSU means you can monitor it via Corsair Link. The software itself isn't the greatest from a user experience point of view, but it does work for the most part. It seems like a small thing, but monitoring the power usage and efficiency is a strangely satisfying thing to do. You can see just how much more power an overclock uses compared to stock, or just how much power your PC is using at idle for example. The connection is via a cable that connects directly to a USB 2.0 header on your motherboard resulting in a very clean installation.
In short I'm absolutely thrilled by this PSU and can heartily recommend it.
Most Recent Customer Reviews
I bought this Power supply unit one month ago, then waited for other components to arrive before assembly my new computer. Read morePublished 7 days ago by Amazon Customer
Brilliant power supply, handles all my system needs and manages to stay ultra quiet even when gaming. Currently running an i7 6700k OC to 4. Read morePublished 15 days ago by Christopher Singam
super solid item
not the biggest power supply but will you never really need anything above 500 unless you are using 2 graphics cards
Fantastic product. Working well as i sit here writing this review. Very easy to install and being modular helps keep things neat. Read morePublished 18 days ago by Stephen Iball
Great power supply. Silent up to 400 W (most of the time for me). Comes with all the cables you'd need. Has its own soft bag which I now use to keep my HTC Vive in. Read morePublished 19 days ago by Amazon Customer