Skip to contentGo to Product Search
Main Content

Customer Ratings & Reviews

No content
  • Corsair RM850x is a black and silver computer power supply unit. It is designed to provide power to a motherboard and its components, including SATA/PATA drives and PCIe slots. The unit has a 12V output and is capable of delivering up to 850 watts of power. The Corsair RM850x is a reliable and high-quality power supply for a wide range of computer systems.
  • Corsair RMx Series Power Supplies: Our Best-Selling Power Supplies, Updated. Fully Modular, Low Noise, and Cybenetics Gold-Certified for Reliable Power.
  • ATX 3.1 Certified: ATX 3.1 and PCle 5.1 compliant, ideal for delivering dependable power to current and future top-performing PCs. 100% Japanese 105C Electrolytic Capacitors. ATX 3.1 PCle 5.1 with 12V-2x6.
  • Fully Modular Connectors: SATA/PATA SATA PATA OSI338v0 Connect only what you need using sleek embossed cables with low-profile combs to make installations a breeze. 1x CPU/PCIe / CPU PCIe 12V-2x6 Native 12V-2x6 GPU cable included for use with modern graphics cards such as the NVIDIA GeForce RTX 40 Series.
  • The image features a 140mm low-noise fan with a fluid dynamic bearing and magnetic dome structure that keeps noise to a minimum. The fan also has a Zero RPM mode, which eliminates fan noise completely at low to medium loads.
  • Get more air through the PSU or override the Zero RPM Mode and low-noise profile of the RMx series with our manual fan override knob, increasing fan speed and airflow.
  • FULLY MODULAR CABLING Connect only the cables you need. 1x ATX (24-pin) 2x ATX 12V (4+4-pin) 3x PCIe (6+2-pin) 1x 12V-2x6 (12+4-pin) 2x 4 SATA (Straight) 1x 3 PATA (4-pin)
  • WORLD-CLASS 24/7 CUSTOMER SUPPORT O COUNTRY LOCAL CORSAIR 10 GUARANTED REGULATIONS YEARS ARE APPLICABLE WORLD-CLASS SUPPORT Our award-winning service means you can enjoy your gear worry-free.
  • CORSAIR X RM850x
  • CORSAIR RM850x
  • The text on the image reads "Corsair RM850x / CPU PCle a CUNDIGAT - NIONTO HYSOO SATA/PATA / SATA, AIL PATA nv ONLY MOTHERBOARD 12V-2x6."
  • Alt View 21. CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black.
  • Alt View 22. CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black.
  • Alt View 23. CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black.
  • The text on the image reads: "MOTHERBOARD 12V-2x6 CPU PU/ PCle / SATA/PATA / PATA DESIGNED FOR USE WITH GENUINE CORSAIR TYPE 4 CABLE SETS ONLY."
  • Corsair RM850x
  • The image shows a variety of Corsair products, including a box and several cords. There are a total of 12 cords, with some of them being black and white. The cords are arranged in a row, and they are all connected to a single box. The box is placed in the middle of the scene, surrounded by the cords. The arrangement suggests that these cords are part of a larger electronic system or setup.

CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

Model:
CP-9020270-NA
SKU:
11066305
$161.99
Save $8
The comparable value is $169.99

Customer reviews

Rating 4.8 out of 5 stars with 345 reviews

Rating Filter

Rating by feature

  • Value

    Rating 4.6 out of 5 stars

  • Quality

    Rating 4.8 out of 5 stars

  • Ease of Use

    Rating 4.8 out of 5 stars

95%
would recommend
to a friend
The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.
Page 13 Showing 241-260 of 345 reviews

  • Great quality!

    |
    |
    Posted . Owned for 1 week when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    operating amazingly purchased as a replacement for the one that went out in my new gaming p./c. and i have yet to have any issues performing as expected,

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • thas cool

    |
    |
    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    great psu in my pc r 9 9700x and rtx 5070 msi gaming trio oc

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • Would definitely buy again.

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Great product cool feature, adjust fan speed. Awesome product

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • PSU Best BUY!

    |
    |
    Posted . Owned for 2 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    psu went out used as a replacement working just fine. Recommend to anyone wanting a upgrade

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • Easy

    |
    |
    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    I love controlling the fan speed and sound with a little turn.

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • Great

    |
    |
    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    This PSU is great. It's modular and has a turn wheel for the fan speed

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • Excellent

    |
    |
    Posted . Owned for 1 week when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Excellent power supply. S tier rated. Don't skimp on the PSU in your system.

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • Great power supply

    |
    |
    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Great power supply. Needed a replacement and this one was perfect

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • Works good.

    |
    |
    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    I like it. Works good with my 4070 super. Very pleased with purchase.

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • 10/10 but again

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Would highly recommend Had for over a year now and no issues at all

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • CORSAIR - RMx Series RM850x

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Just enough juice to power a 5700x3D and a RTX 5080.

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • RM850X

    |
    |
    Posted . Owned for 2 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Excellent power supply... i recoment 100% and wire for graphic card is 1 i like...

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • Good psu

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Easy to work with solid so far, comes with plenty of cablea

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • One of the best power supplies you can get

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Upgraded from a rm750e when I upgraded to a newer video card. Gets the job done

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • Power supply

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    It's a power supply, worked as expected. Nothing special.

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • Corsair 850W

    |
    |
    Posted . Owned for 2 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Works well, easy to set up and don’t have to plug in every cable if not necessary. Only complaint I have is that I wish the wires were more harnessed up, they do include zip ties though.

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    No, I would not recommend this to a friend

  • Corsair PSU

    |
    |
    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Works amazing, never had any problems with Corsair power supplies.

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • Would recommend

    |
    |
    Posted . Owned for 2 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Bought this for my wife’s PC. Exactly what she needed. Perfect power supply.

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • Exactly what you need

    |
    |
    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Great standard power supply, enough to power 99% of pc's

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend

  • Worth every penny

    |
    |
    Posted . Owned for 1 week when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Great power supply, it was just what i needed for my 4070 super

    This review is from CORSAIR - RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply - Black

    I would recommend this to a friend
Page 13, Showing 241-260 of 345 reviews
Sign in or Create Account

Get the latest deals and more.

Best Buy appLearn more
Share on YouTubeShare on InstagramShare on TikTokShare on FacebookShare on PinterestShare on X
Best Buy Canada
AccessibilityTerms & ConditionsPrivacyInterest-Based AdsState Privacy RightsHealth Data PrivacyDo Not Sell/Share My Personal InformationLimit Use of My Sensitive Personal InformationTargeted Advertising Opt OutCA Supply Chain Transparency Act
In-store pricing may vary. Prices and offers are subject to change. © 2026 Best Buy. All rights reserved. BEST BUY, the BEST BUY logo, the tag design, and MY BEST BUY are trademarks of Best Buy and its affiliated companies.