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Customer Ratings & Reviews

Your price for this item is $72.49
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The comparable value price is $144.99

Customer reviews

Rating 4.8 out of 5 stars with 1846 reviews

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Rating by feature

  • Value

    Rating 4.6 out of 5 stars

  • Quality

    Rating 4.8 out of 5 stars

  • Ease of Use

    Rating 4.7 out of 5 stars

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96%would recommend to a friend

Customers are saying

Customers are pleased with the RMx Series 850W power supply's ample power, modular design, and quiet operation. Many appreciate the high-quality components and easy installation. While some users reported an audible coil whine, the majority found the unit to run cool and efficiently. The positive feedback on quality and ease of use outweighs the relatively few negative comments.

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 32 Showing 621-640 of 1,846 reviews
  • Rated 5 out of 5 stars

    Clean Power

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

    I needed a power supply and it was hard to pass this one up when it was on sale for $110. I've heard a lot of good things about Corsair power supplies, and the unit I received didn't disappoint. I hooked my supply up to a load prior to installing it in my build and checked the outputs with a scope and saw really nice flat DC signals. Voltage ripple was really low even for my low end setup and I wasn't seeing any ringing or switching spikes like I've seen with other supplies.

    I would recommend this to a friend
  • Pros mentioned:
    Modular

    Rated 5 out of 5 stars

    Great power supply

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

    Fully modular cables, so you only connect the cables your system needs. Fan size-5.3 inch. iCUE Compatibility-No. Modern Standby Compatible-No.

    I would recommend this to a friend
  • Pros mentioned:
    Power

    Rated 5 out of 5 stars

    Well made PSU

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

    Very sturdy build quality with a nice weight to it. Comes with plenty of cables and power. If you get this you won't be disappointed.

    I would recommend this to a friend
  • Pros mentioned:
    Noise level

    Rated 5 out of 5 stars

    Great value for a PSU

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

    I've done builds with Corsair PSUs for years and they never let me down. This one is no exception. Easy to install, good cabling included, and very quiet.

    I would recommend this to a friend
  • Pros mentioned:
    Power

    Rated 5 out of 5 stars

    Great PSU for the Price

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

    I bought this as a quick replacement for my SeaSonic 860w and don't regret it at all. Easily feeds enough power to my Ryzen 2600 and RX 590 that are both overclocked.

    I would recommend this to a friend
  • Pros mentioned:
    Power

    Rated 5 out of 5 stars

    Amazing PSU

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    Posted . Owned for 5 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Have had no issues with this power supply. Have it connected to an AMD 3950x as well as a RTX 3090 and it has plenty of power still.

    I would recommend this to a friend
  • Rated 5 out of 5 stars

    PSU with full modularity!

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

    Great product great warranty everything I needed. Out of the box I justed tested it first to make sure it worked then install was simple.

    I would recommend this to a friend
  • Pros mentioned:
    Power

    Rated 5 out of 5 stars

    Top Powersupply on the market

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

    One of the best power supply on the market and from Corsair. Glad that BestBuy sold these or else I would've ordered it online.

    I would recommend this to a friend
  • Pros mentioned:
    Quality

    Rated 5 out of 5 stars

    850 watt Corsair

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

    Great quality from Corsair, never had an issue with them, I’m running multiple graphics cards no problem for this 850 watt

    I would recommend this to a friend
  • Pros mentioned:
    Power

    Rated 5 out of 5 stars

    Corsair RM850X power supply unit

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

    Replaced a cheaper lesser known PSU with this one and now have a stable power supply on my gaming PC. Would highly recommend.

    I would recommend this to a friend
  • Pros mentioned:
    Power

    Rated 5 out of 5 stars

    Great power supply!

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

    Great power supply, very stable. The modular cables are great to control having all kinds of wiring in your case. Definitely recommend.

    I would recommend this to a friend
  • Pros mentioned:
    Modular

    Rated 5 out of 5 stars

    Top Quality

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

    Top quality power supply. The fully modular design makes your system far less crowded with unnecessary cables so air flow is less restricted.

    I would recommend this to a friend
  • Pros mentioned:
    Power

    Rated 5 out of 5 stars

    Powerful

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

    This PSU has no problem powering my Ryzen 9 3900x with a 2070 super. I have no doubt it'll handle the 3080 when I plan to upgrade as well.

    I would recommend this to a friend
  • Pros mentioned:
    Quality

    Rated 5 out of 5 stars

    Exactly as expected.

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

    It's fully modular, 80 plus gold rated, well made, and from one of the best brands in the industry. It does what it's supposed to.

    I would recommend this to a friend
  • Pros mentioned:
    Noise level

    Rated 5 out of 5 stars

    Easy to install

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

    Easy to install... a lot of optional cables and your not going to use them all... very quiet and u know its made by corsair quality

    I would recommend this to a friend
  • Pros mentioned:
    Quality

    Rated 5 out of 5 stars

    Sturdy PSU

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

    Reliable, sturdy power supply that'll provide enough power for almost any day-to-day computing application you can throw at it.

    I would recommend this to a friend
  • Pros mentioned:
    Power

    Rated 5 out of 5 stars

    Corsair Power Supply

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

    Always liked Corsair power supplies. This one has the power I needed at a great price

    I would recommend this to a friend
  • Pros mentioned:
    Power

    Rated 5 out of 5 stars

    Perfect replacement!

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

    I needed a replacement psu and the Corsair rm850x was the right size, fit, and power requirement for my pc. Works as expected.

    I would recommend this to a friend
  • Pros mentioned:
    Power

    Rated 5 out of 5 stars

    Solid power supply. Greater value.

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

    Solid power supply. Great Value. Perfect if you are able to get a 3000 version nvidia card. Quiet and clean power delivery.

    I would recommend this to a friend
  • Pros mentioned:
    Noise level

    Rated 5 out of 5 stars

    Excellent PSU

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

    PSU works perfectly and is super quiet. Never see the PSU fan running unless a lot, A LOTTTT, of CPU and RAM being used at the same time.

    I would recommend this to a friend