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Corsair CP-9020056-UK RM Series RM850 80 Plus Gold 850W ATX/EPS Fully Modular Power Supply Unit

4.5 out of 5 stars 484 customer reviews
| 158 answered questions

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RM Seies
850W
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  • 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)

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Style Name: RM Seies | Size Name: 850W

Product Information

Style Name: RM Seies | Size: 850W
Technical Details
BrandCorsair
Item Weight3.4 Kg
Product Dimensions18 x 15 x 8.6 cm
Item model numberCP-9020056-UK
Wattage935 watts
Lithium Battery Weight7 Grams
  
Additional Information
ASINB00FG9FZS2
Best Sellers Rank 19,332 in Computers (See top 100)
Shipping Weight3.6 Kg
Date First Available26 Sept. 2013
  
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Product Description

Style Name:RM Seies  |  Size Name:850W

Product Description

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).

Box Contains

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


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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Style Name: RM SeiesSize: 1000W Verified Purchase
I would be giving this 5 stars as the power unit is great, and fully lives up to the claims for low noise emissions. Since the fan for the unit doesn't come on until the draw on the unit exceeds a pre set limit, it is eerily quiet when you start the machine. if you have a high end gaming machine or work with 3d model data then this is the power supply for you. The only niggle and it is a niggle, is that the cables which come in modular form are very stiff!. It makes it a bit tricky to fit if your case is a bit cramped. On the plus side it almost negates the use of cable ties, because once you bend them clear of any fans, they are staying put, even in an earthquake. Well worth the money for the build quality.
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Style Name: RM SeiesSize: 1000W Verified Purchase
I recently had to RMA my trusty HX1000 power supply after 4 and a half years of hard use. Corsair sent me the RM1000 as a replacement since the HX1000 has been discontinued and I thought I would leave a review on here for those thinking of buying this PSU.
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!
-Highly recommended.

**Update (750w)**

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.
5 Comments 30 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: RM SeiesSize: 850W Verified Purchase
Faulty batchs have been sold via amazon even though CORSAIR have recalled these back. I recieved one with a faulty batch number. I contacted corsair they were willing to send one that has been produced latter on the year which fixes the issues of the fan never spining. But i just got a refund from amazon and bought EVGA 850 Supernova instead.

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.
6 Comments 50 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: RM SeiesSize: 750W Verified Purchase
A good enough psu let down by absolutely no connection manual in the box. Imagine an amateur builder on their first pc with no instructions- wave bye bye to some components in that situation. I build machines quite a lot and always like to see some guidance - so annoyed that Corsair left it out hence 4 stars. Nice cables all black and good enough length for full sized ATX case with concealed routing. Support for modern motherboards is there as well as pciE cards dual and single and has its own on off switch next to the IEC socket. Got mine running AMD FX and Asus Mobo with GTX 750 pciE graphics card; 1 ssd and 6 hdds as well as usb3 support with hot swap bays and water cooler - more than enough power from this compact brick.
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Style Name: RMi SeriesSize: 850W Verified Purchase
A very, very easy 5 stars. It's quite difficult for a PSU to 'wow' you since ultimately it just provides power for your PC. If it works well you won't notice it which inevitably means the PSU is often overlooked. I don't have the tools to vouch for voltage regulation & ripple but the reviews I've seen show this PSU is exceptional at both.

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.
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Style Name: RM Seies | Size Name: 850W