Appliances Presidents’ Day SaleEnds 2/25. Limited quantities. No rainchecks.Shop now

Skip to contentGo to Product SearchGo to Footer
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:
6587623
Highly rated by customers for:
$135.99
Save $34
Comp. Value: $169.99

Customer reviews

Rating 4.8 out of 5 stars with 318 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

Pros mentioned filter

Cons mentioned filter

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

Customers are saying

Customers enjoy the RMx Series RM850x power supply for its overall performance and quiet operation, with many appreciating the zero fan mode. The fully modular cables also make cable management easier, and the installation process is straightforward. With its adjustable fan and good modularity, this power supply is a popular choice for those needing ample power.

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 318 reviews

  • 5/5

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

    Product works beautifully nice features. Could have included more zipties and wire holders.

    I would recommend this to a friend

  • For the price, it does it's job.

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

    For it's price. It does it job. I wasn't expecting to need CableMod items when getting this. But that's for another time. Just FYI. Their not molded cables, or sleeved. Their loose, good for cable mod bits like combs. So be mindful.

    No, I would not recommend this to a friend

  • Good until it breaks

    |
    |
    Posted . Owned for 11 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Broke down within a 1.5 years. Definitely would not recommend. Buy something else.

    No, I would not recommend this to a friend

  • Good quality

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

    Great product for the price I recommend for next time

    I would recommend this to a friend

  • Good, but Overheating Issue Less than Year

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

    Good PSU, but recently had issue with USB shutting down. Noticed that the PSU was way hotong than it should be. Got it back in April issues started after 5 months. 6 months it happened more often.

    I would recommend this to a friend

  • Solid Power Supply From Corsair

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

    Absolutely amazing power supply does exactly what it's meant to do. Good futureproofing.

    I would recommend this to a friend

  • Happy customer

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

    Can’t go wrong with the RMx series from Corsair. High quality PSU.

    I would recommend this to a friend

  • Great Product!!

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

    Nicely sleeved cables, very quiet under load and efficient

    I would recommend this to a friend

  • Pc power supply

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

    Works well, glad they had it in stock and was able get my pc up and running

    I would recommend this to a friend

  • Efficient and Affordable

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

    Exactly what I needed to build a solid budget gaming PC!

    I would recommend this to a friend

  • Perfect product

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

    Great PSU, comes with all attachments, highly recommend

    I would recommend this to a friend

  • A Japanese product, no doubt it will last!

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

    Better get this if you’re building new pc that has many fans and higher specs!

    I would recommend this to a friend

  • Power supply

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

    Its is good power supply but its weekness is all the cables come with this unit is poor quality, my old motherboard is not supported

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

    Questionable

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

    Have had other Corsair power supplies that have lasted. This new RM850x 2024 ATX3.1 model is questionable. The new cables are nice and thin for easy management, but some of the connector do not seat easily/properly. With new RTX50 series already melting down with nvidia saying improperly seated cables this one leaves me questioning if I should keep it. Still debating on returning.

    No, I would not recommend this to a friend
    • Brand response from Corsair
      Posted .

      Hello,

      All connectors should be seating correctly when connected, please reach out to our team directly on our site for assistance: help.corsair.com

      -Art CorsairGaming

  • Great idea

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

    Plugged in easy and runs nice, my setup is great, 10/10

    I would recommend this to a friend

  • Meh

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

    Bit of an oddity with this one. I think it's a model issue. The standby power for sleep or turn on from Windows shutdown does not hold enough power to boot the machine. Replaced it with the exact same model and the same issue occurs. The only way to remedy it is to turn the power supply off and on. Old PSU behaved normally. I am using an AM4 board so perhaps there is something to do with it there but odd none the less.

    No, I would not recommend this to a friend
    • Brand response from Corsair
      Posted .

      Hello,

      Sounds like an issue our team could assist with, please don't hesitate reaching out directly: help.corsair.com

      -Art CorsairGaming

  • Perfect Price!!

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

    Great item and great price! will fit my build perfect

    I would recommend this to a friend

  • Not compatible with my taichi x99 mb

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

    I have tried two of these units with my asrock taichi x99 motherboard. My system works perfect with my hx750i. I have tried everything I know to get it to work. I will have to spend more to get a single rail design. I'm sure it works amazing on other systems. Just not mine for some in depth reason.

    I would recommend this to a friend
    • Brand response from Corsair
      Posted .

      Hello Nate,

      That's strange. Did you switch out all the cables and used the ones that are included in the new units? Do contact our team for assistance: help.corsair.com

      -Art CorsairGaming

  • Best Buy Employee

    Great

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

    Devices work as intended, came in quickly, pickup was easy

    I would recommend this to a friend

  • Mone was broken

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

    I purchased this while building my new pc and this ended up being broken. And was causing problems for my pc.

    No, I would not recommend this to a friend
Page 15, Showing 281-300 of 318 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.