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Corsair RM850 (2021), RM Series, 850 Watt 80 Plus Gold Fully Modular ATX Power Supply (Three EPS12V Ports, Quiet Operation, Zero RPM Fan Mode, Capacitors Rated at 105 °C), White

4.7 out of 5 stars 865 ratings
Model name rm850
Brand Corsair
Compatible devices cellphone
Connector type SATA
Output wattage 850
Form factor ATX
Wattage 850 watts
Cooling method Air
Item dimensions L x W x H 24 x 69 x 2.5 centimetres
Item weight 1.5 kg

About this item

  • Fully modular cables Connect only the most necessary cables to give your system a neat and tidy look
  • Three EPS12V ports For full compatibility with modern graphics cards and motherboards
  • Tuned for quiet operation A 140mm fan with rifling bearing and a customized fan curve keep volume to a minimum even at full power
  • Zero RPM Fan Mode For small and medium loads, the fan is completely switched off for virtually silent operation
  • 105 C rated capacitors Industrial grade capacitors provide excellent electrical performance and reliability
  • Brilliant white chassis Enhance the modern look of your white PC build with a matching color power supply
  • Note: For more information, please refer to the product guides and documents.
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Top Brand

Corsair

95% positive ratings from 10K+ customers

50K+ recent orders from this brand

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Price—£148.07-11% £124.99
Was: £139.68		£89.00-9% £124.99
RRP: £137.90		-4% £110.00
RRP: £113.99
Delivery—
Get it 4 – 8 Jul
Get it as soon as Wednesday, Jul 2
Get it as soon as Tuesday, Jul 8
Get it as soon as Wednesday, Jul 2
Get it as soon as Friday, Jul 25
Customer Ratings
4.74.7 out of 5 stars865
4.84.8 out of 5 stars328
4.54.5 out of 5 stars388
4.54.5 out of 5 stars214
4.64.6 out of 5 stars2,366
4.84.8 out of 5 stars6
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From the brand

Product description

The fully modular ultra-quiet CORSAIR RM Series power supplies provide your PC with consistently efficient 80 PLUS Gold performance. With three EPS12V cables and four 8-pin PCIe power connectors, RM power supplies provide all the connectivity needed to power modern and demanding PC upgrades. Industrial-grade capacitors rated at 105°C provide superior electrical performance and reliability and are backed by a ten-year warranty. With support for Modern Standby mode, you can wake up your computer faster from sleep mode and benefit from lower power consumption. Zero RPM fan mode allows virtually silent operation at low and medium loads. Fully modular cables make PCBuilds and upgrades easier by simply connecting the cables your system actually needs. RM power supplies are quiet, highly efficient and provide reliable power to your high-performance PC for years to come.

Box contents:
1 x 24-pin ATX connector (24)
3 ATX 12V/EPS12V connectors (4+4)
4 PCIe ports (6+2)
14 SATA ports (straight).
4 PATA ports

Note: For more information, please refer to the product guides and documents.

Product information

Technical Details

Brand ‎Corsair
Product Dimensions ‎24 x 69 x 2.5 cm; 1.5 kg
Batteries ‎1 Lithium Ion batteries required.
Item model number ‎CP-9020232-EU
Manufacturer ‎Corsair Holdings (Hong Kong) Limited
Series ‎rm850
Colour ‎White
Form Factor ‎ATX
Voltage ‎220
Wattage ‎850 watts
Are Batteries Included ‎No
Lithium Battery Energy Content ‎2 Kilowatt Hours
Lithium Battery Packaging ‎Batteries packed with equipment
Lithium Battery Weight ‎2 g
Number Of Lithium Ion Cells ‎5
Number of Lithium Metal Cells ‎5
Item Weight ‎1.5 kg
Guaranteed software updates until ‎unknown

Additional Information

ASIN B097F55SB9
Customer Reviews
4.7 out of 5 stars 865 ratings

4.7 out of 5 stars
Best Sellers Rank
Date First Available 22 Jun. 2021

Warranty & Support

Amazon.com Return Policy:Regardless of your statutory right of withdrawal, you enjoy a 30-day right of return for many products. For exceptions and conditions, see Return details.

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Corsair RM850 (2021), RM Series, 850 Watt 80 Plus Gold Fully Modular ATX Power Supply (Three EPS12V Ports, Quiet Operation, Zero RPM Fan Mode, Capacitors Rated at 105 °C), White

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Customer reviews

4.7 out of 5 stars
865 global ratings

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Top reviews from United Kingdom

  • Bry & Liz
    1.0 out of 5 stars Don't be fooled into buying the RM Version
    Reviewed in the United Kingdom on 16 October 2023
    Don't be fooled into buying the RM Version BUY THE RMX Version, sooo much quiter than the RM and much better internals
    Helpful
     Report

Top reviews from other countries

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  • Bob Hasevoets
    5.0 out of 5 stars Super
    Reviewed in Belgium on 4 March 2025
    Verified Purchase
    *
    Report
  • Ignacio B.
    5.0 out of 5 stars Silenciosa, potente y muy estable
    Reviewed in Spain on 27 May 2025
    Verified Purchase
    Muy buena fuente de alimentación. Es estable, silenciosa y potente, ideal para soportar una gráfica de última generación sin problemas.
    Desde que la instalé, no he tenido que hacer ningún ajuste ni tocar nada. Funciona perfectamente y me da mucha tranquilidad saber que todo el sistema está bien alimentado.
    Estoy muy contento con la compra.
    Report
  • Arturo S.
    5.0 out of 5 stars Muy fiable
    Reviewed in Spain on 18 June 2025
    Verified Purchase
    De las fuentes mas fiables en mi opinión, te viene con todo tipo de cables modulares con tela muy bonitos
    Report
  • Abdulaziz
    1.0 out of 5 stars product was opened and some parts were missing
    Reviewed in Saudi Arabia on 26 April 2025
    Verified Purchase
    The product was opened and some parts were missing.
    Report
  • Laurent Hugot
    5.0 out of 5 stars Impeccable!
    Reviewed in Belgium on 25 September 2023
    Verified Purchase
    Installation simple car modulaire, pas de bordel inutile dans la tour pour gêner le flux d’air.
    Les composants internes à l’alimentation sont d’excellente qualité, la certification énergétique vérifiée et cohérente. Le prix pas abusif pour le produit. Recommandé chaudement !
    Report