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Scan code: LN65076 Manufacturer code: CP-9020083-UK

Corsair RMi Series 850W Fully Modular Power Supply

850W Corsair RM850i, Full Modular, 80 PLUS Gold, SLI/CrossFire, Single/Multi Rail, 70.8A, 135mm Fan, ATX PSU

Thumbnail 1 : Corsair RMi Series 850W Fully Modular Power Supply Thumbnail 2 : Corsair RMi Series 850W Fully Modular Power Supply Thumbnail 3 : Corsair RMi Series 850W Fully Modular Power Supply Thumbnail 4 : Corsair RMi Series 850W Fully Modular Power Supply Corsair RMi Series 850W Fully Modular Power Supply : video thumbnail 1
Scan code: LN65076 Manufacturer code: CP-9020083-UK
review 3xs Approved
RRP: £154.99
From £9.17 / month (APR 0%)
Monthly Payment: £18.34
Instalment Rate: 0% p.a. (fixed)
Cost of purchase: £109.99
Total inc. interest: £109.99
Monthly Payment: £9.17
Instalment Rate: 0% p.a. (fixed)
Cost of purchase: £109.99
Total inc. interest: £109.99
If you are approved for a credit limit with PayPal Credit and use it for future purchases, the APR for those purchases won't be more than 19.9% and may be even lower.

Representative Example:

Purchase Rate: 19.9% p.a. (variable)

Representative: 19.9% APR (variable)

Assumed Credit Limit: £1,200

Subject to status. Terms and Conditions apply.
spend over £225 and Buy Now, Pay Later or spread the cost of your finance over 24-48 months with a 10% deposit.
Delivery Options
  • By DPD On 9th Dec To 11th Dec to your specified address. | £5.48 Receive SMS with one-hour delivery window Weekend, timed and European delivery options are available at checkout

    Have your parcel delivered by DPD to your specified address. Receive SMS with one-hour delivery window

    Weekend, timed and European delivery options are available at checkout
  • Collect instore Collect from our Bolton store, BL6 6PE | Free

    Order online, collect from our Bolton store (25-28 Enterprise Park, Middlebrook, Horwich, Bolton, BL6 6PE)

  • UPS and DPD Pickup Pickup from local convenience store | £4.79

    Collect your parcel from your newsagents, petrol stations and convenience stores

  • SCANPROTECT Protect against installation damage for 28 days. More info

    ScanProtect is an enhanced warranty specifically designed and offered by Scan to reduce the risk of any mishap or damage to components during installation.

    Our aim with ScanProtect is to encourage our customers to upgrade or build their own PC confidently. For a small additional fee our customers are provided with complete peace of mind.

  • 48HR REPLACEMENT If you need to return this item, your replacement will be dispatched within 2 working days of your product arriving back at Scan. More info
Frequently Bought Together

RM850i - Corsair Power Supply - Fully Modular ATX PSU

Corsair RM850i Power Supply 80PLUS - Gold

Corsair RMi 850W Power Supply

This version of the RMi Series power supplies from corsair comes with a total power output of 850W. The RM850i gives you extremely tight voltage control with near quiet operation. The 80PLUS GOLD rating on this PSU reduces operating costs and excess heat. It also features a fully modular cable set, these DC cables makes building and upgrading your PC easier and leaves it looking great. The Zero RPM fan mode ensures virtual silence at low and medium loads. The RMi Series also features the Corsair Link Digital which makes it extremely easy to monitor the power supplies performance along with toggling single rail or multi rail modes, or controling fan speed directly from your desktop.

View other RMi power outputs:
RM650i - RM750i - RM1000i

Fully Modular Connectivity


RMi Fully Modular Cable Design

The fully modular design of the RMi power supply means that during your build you can mount the PSU in the case first and then attatch only the cables you need, making builds and upgrades easy with great looking results. In addition the advanced desktop app lets you monitor and log fan speed, voltages and power consumption, as well as control and configure +12V rail operation.

RM850i Efficiency & Noise Graphs


Efficiency Graph


Noise Graph

Corsair RM850i Output Power Chart

DC Output +3.3V +5V +12V -12V +5Vsb
Max Load 25A 25A 70.8A 0.8A 3A
Maximum Combined Wattage 150W 850W 9.6W 15W
Total Power: 850W
DC Output +3.3V +5V +12V1 +12V2 -12V3 +12V4 +12V5 +12V6 +12V7 -12V8 +12V +5VSB
Max Load 25A 25A 40A 40A 40A 40A 40A 40A 40A 40A 0.8A 3A
Maximum Combined 150W 850W 9.6W 15W
Total Power: 850W

Corsair RM850i Key Features

80PLUS - Gold

80 PLUS Gold CertifiedGold certification ensures high efficiency operation for less excess heat and lower operating costs.

Japanese Capacitors

Japanese 105°C capacitorsPremium internal components ensure solid power delivery and long term reliability.

Zero Fan Mode

Zero RPM Fan ModeFan doesn’t turn on until it’s needed, so you’ll enjoy virtually silent operation at low and medium loads.

10 Year Warranty

Configurable +12V RailIt’s your choice – run it in the default multi-rail +12V mode, or toggle single-rail operation.

Size ATX
Edition RM850i
Wattage 850 W
80 PLUS Certification 80 PLUS Gold
Max. Efficiency (at 230Vac) 92 %
Cooling Fan
Fans 1 x 135mm
Internal +12V Rails Single/Multi Rail
Rail 1 +12V 70.8 A
Rail 2 +12V N/A
Rail 3 +12V N/A
Rail 4 +12V N/A
Rail 5 +12V N/A
Rail 6 +12V N/A
Max. Combined Output +12V 70.8 A
Modular Yes
Modularity Full Modular
SLI/CrossFire Yes
EPS 12V Yes
Motherboard Connector 20+4-pin
  • 2 x 4+4-pin CPU +12V (EPS)
  • 1 x 4-pin ATX 12V
  • 2 x 4-pin FDD Power
  • 8 x 4-pin Molex
  • 6 x 6+2-pin PCIe
  • 10 x SATA
Dimensions 150 x 86 x 180 mm (WxHxD)
Package Type Retail
Additional Information
Scan Code LN65076
Model Number CP-9020083-UK
GTIN 0843591045698

Please note your statutory rights are not affected.

For further information regarding Scan's warranty procedure please see our terms and conditions

120 months
Return to base
RTB Period:
120 months
Manufacturer Contact Details
0871 472 4747
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TekSpek Guides
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80 Plus certification
80 Plus certification
Date Issued: 18th Nov 2010

Conceived back in 2004 and brought to market just a year later, the 80 PLUS initiative is one of many standards introduced in an effort to increase energy efficiency in modern technology. Targeting computer power supplies, it awards PSUs that are able to achieve an energy efficiency of over 80 per cent at varying workloads and a power factor of 0.9 or more at 100 per cent load.

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850W Corsair RM850i, Full Modular, 80 PLUS Gold, SLI/CrossFire, Single/Multi Rail, 70.8A, 135mm Fan, ATX PSU is rated 4.5 out of 5 by 6.
Rated 2 out of 5 by from Makes buzzing noise Bought for a new system. On idle there is a constant buzzing noise coming from the PSU itself. Imagine some fly constantly buzzing in there. Its not the GPU because i put my ear right next to it and heard it clearly coming from the PSU. Under heavy load it gets louder but not extremely loud. If you had this under a desk it wouldnt be a problem but on my table I can hear it if I take my headphones off. Bought this for its "quiet operation." Little disappointed honestly. Other than that annoyance, runs fine and the cables are sleeved well.
Date published: 2017-07-28
Rated 5 out of 5 by from Great quality, no problems so far I have three HDDs, an SSD, an i7 processor, a GTX 970 GPU and an X-99 PRO motherboard. This PSU has supplied all of them under stress with zero problems so far. The modular cables were a lifesaver for my horrible cable managing skills, with a lot of cables and slots left over for future expansion without taking up unnecessary space in the case. I'd definitely recommend a modular PSU to pretty much everyone who is concerned with cable management or has very little space, the extra price is well worth the time and ease of use.
Date published: 2016-07-19
Rated 5 out of 5 by from Very happy Bought this to replace an old 650w Corsair ready for upgrading everything else in my rig. Not had a modular PSU before, but it allows for nice neat cabling with enough supplied for my needs. The voltages are all stable and the Corsair link software can make a handy system monitor. Very quiet as the fan has never kicked in so far, there is a test button so you can check it actually does work. Long warranty and the build quality is good. The price was right and the delivery fast and efficient.
Date published: 2016-04-08
Rated 5 out of 5 by from Very quiet! I replaced a 500W PSU with this, it was a bit bigger than the old one so took a bit of fiddling to get it in but I expected this. The main thing I noticed was how quiet it is! the old one resonated with a nearby radiator when running but not this one, thankfully. The main problem was that my MB has a 4 pin CPU power socket. I couldn't find a 4 pin lead in the supplied leads, so called Scan who were most helpful and quickly sent a replacement one. With an 8 pin plug (2X4). I sat down and had a cuppa. then fiddled about and found that either the left or right half of the 2X4 plug fitted the socket. I Googled it and saw that the 8 pin plug can be fitted this way, one side plugged in and the other redundant. If I'd only been told this in the first place.....
Date published: 2016-04-01
Rated 5 out of 5 by from Great Power Supply!! Extremely quiet even under load Zero RPM fan mode works perfectly and stays off even under lite gaming loads Monitoring software works great, letting you know how many watts is being drawn at any time and allowing for custom fan curves. More than enough cables in nicely package bag allowing for SLI/Crossfire configurations out of the box Overall great product and worth the investment!
Date published: 2016-03-30
Rated 5 out of 5 by from all the power you need. great little PSU, The packaging is superb, with a draw string bag for the psu itself, and a bag with all the cables in. The cables are mostly braided, with the exception of sata power and the usb for corslink. Runs quiet and cool, easy install, very happy with the product
Date published: 2016-02-29
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Questions & Answers

Is this good enough for a gaming PC

My old PSU has died it was a Corsair AX 850 would this be good enough for gaming? or would be better?
Asked by: Loateal
Hello, This would be suitable for most gaming rigs. Thanks,
Answered by: LizN
Date published: 2016-05-28
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Corsair RMi Series 850W Fully Modular Power Supply
Corsair RMi Series 850W Fully Modular Power Supply