Memorial Day SaleEnds 5/25. Limited quantities. No rainchecks.Shop now

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 How to Build a PC - How To Video video 1 minutes 34 seconds

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

Model:
CP-9020270-NA
SKU:
6587623
Highly rated by customers for:
$169.99

Customer reviews

Rating 4.8 out of 5 stars with 358 reviews

Rating Filter

Rating by feature

  • Value

    Rating 4.7 out of 5 stars

  • Quality

    Rating 4.8 out of 5 stars

  • Ease of Use

    Rating 4.8 out of 5 stars

Pros mentioned filter

Cons mentioned filter

There aren't enough negative mentions yet.
95%would recommend to a friend

Customers are saying

Customers are delighted by the RMx Series RM850x Cybenetics Gold Fully Modular ATX Power Supply's overall performance, noting that their computers run perfectly. They appreciate its quiet operation, even when the system is under heavy use, and find the cable management to be very easy. Additionally, customers find the installation to be easy and like the adjustable fan.

This summary was generated by AI based on customer reviews.

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 15 Showing 281-300 of 358 reviews

  • Fantastic PSU

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

    I just upgrade from a 2015 version Corsair RM750x that was still working and gave me no problems, but i wanted to be in warranty again with a new PSU, have the 3.1 atx, and have the 12VHPWR connector is really great for my 4070 super. The 140mm fan makes if very quiet, and having the 10 year warranty is a great peace of mind.

    I would recommend this to a friend

  • Excellent Product & Customer Service

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

    Excellent quality of the product itself, and amazing customer service, was able to get it the day of my order with no issues. 10/10 would recommend.

    I would recommend this to a friend

  • A Tier PSU.

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

    Corsair rm850x is an a tier rated psu which is why i purchased it. Also corsair is just known to be reputable. Also got it on sale which was a big win.

    I would recommend this to a friend

  • Great Safety Feature

    |
    |
    Posted . Owned for 7 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    I love the safety feature of the power supply. It saved me so much money by not having to buy other parts when a power surge happened in my apartment.

    I would recommend this to a friend
  • Pros mentioned:
    Overall performance

    Nice Psu

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

    Very good and reliable psu. I like it very much!!!

    I would recommend this to a friend
  • Pros mentioned:
    Cable management

    Nice PSU

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

    Nice power supply, comes with high quality cables as well.

    I would recommend this to a friend

  • Great

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

    Only complaint is the cables arent tied together but they do include plenty of zip ties

    I would recommend this to a friend
  • Pros mentioned:
    Cable management

    Great power supply

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

    Very simple to install and clean mes with every cable you need.

    I would recommend this to a friend

  • 3rd solid Corsair Power Supply

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

    This is the third Corsair power supply that I have purchased for three PC builds and they have all been solid.

    I would recommend this to a friend
  • Pros mentioned:
    Overall performance

    Works good

    |
    |
    Posted . Owned for 6 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Work great had no problem so far,most definitely recommend

    I would recommend this to a friend

  • I recommend

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

    Good PSU... bit pricey but overall worth the quality

    I would recommend this to a friend

  • Best value / quality

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

    Great ripple suppression, load regulation, and 12v stability. If you find it on sale, no other psu comes close to the value. Competes directly with SF Leadex VII XP Pro plat.

    I would recommend this to a friend

  • Good power supply able to manage and hide cabling

    |
    |
    Posted . Owned for 7 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Good power supply for the money needed a replacement for a power supply that was new that failed in under 2 months

    I would recommend this to a friend

  • Fixed Kernel Issues

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

    I swapped to this PSU after the initial 850w I was utilizing was providing too much to the motherboard 12v causing kernel issues. All readings on the PSU are within the 5% range and I have not had issues in the last month.

    I would recommend this to a friend

  • Needed this for my gpu

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

    My old psu didnt have enough pcie cables to power my new 9070xt. This psu did and so far everything is perfect

    I would recommend this to a friend

  • Game on

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

    I brought a gaming computer from another country to the USA and ofc needed to switch out the power supply, happy with my decision

    I would recommend this to a friend

  • Good PSU

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

    Great PSU from Corsair. Their products can be a bit pricier then the competition but they are normally of good quality.

    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.

    Love that the geek squad walked us through every step of my sons custom build computer.. I do t know all the lingo basically there for support and to pay. My son loves it

    I would recommend this to a friend
  • Pros mentioned:
    Overall performance

    Power Supply

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

    Works great! Using it very day! Price was descent.

    I would recommend this to a friend

  • Good PSU

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

    Pretty good and customisable PSU. Wasn't too big a fan of the cables that were supplied. But I didn't pay attention to what kind they were when I bought it

    I would recommend this to a friend
Page 15, Showing 281-300 of 358 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.