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Corsair RMX Series, RM850x, 850 Watt, 80+ Gold Certified, Fully Modular Power Supply (Low Noise, Zero RPM Fan Mode, 105°C Capacitors, Fully Modular Cables, Compact Size) Black

4.8 4.8 out of 5 stars 12,921 ratings
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Amazon's Choice in Computer Power Supplies by Corsair

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RM850X
Power Supply

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About this item

  • 80 Plus Gold certified for lower power consumption, less noise and cooler temperatures
  • For maximum cooling surface area and performance
  • Zero RPM fan mode for near silent operation at low to medium loads; Continuous output rated temperature: 50°C
  • 100 percent industrial grade, 105°C rated Japanese capacitors ensure unwavering power and reliability
  • Fully modular cables, so you only connect the cables your system needs. Fan size-5.3 inches. iCUE Compatibility-No. Modern Standby Compatible- No
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Corsair RMX Series, RM850x, 850 Watt, 80+ Gold Certified, Fully Modular Power Supply (Low Noise, Zero RPM Fan Mode, 105°C Capacitors, Fully Modular Cables, Compact Size) Black
Corsair RMX Series, RM850x, 850 Watt, 80+ Gold Certified, Fully Modular Power Supply (Low Noise, Zero RPM Fan Mode, 105°C Capacitors, Fully Modular Cables, Compact Size) Black
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Corsair RMX Series, RM750x, 750 Watt, 80+ Gold Certified, Fully Modular Power Supply (Low Noise, Zero RPM Fan Mode, 105°C Capacitors, Fully Modular Cables, Compact Size) Black
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Price$180.99$209.99$139.99-17% $124.99
List:$149.99
-14% $162.99
List:$189.99
$169.97
Delivery
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it Mar 29 - Apr 2
Customer Ratings
Noise level
4.6
4.5
4.4
4.5
4.5
4.6
Energy efficiency
4.6
4.6
4.3
4.5
4.5
4.6
Easy to install
4.5
4.5
4.5
4.4
4.4
4.5
Quality of material
4.5
5.0
4.1
4.2
4.2
4.5
Value for money
4.2
4.6
4.3
4.2
4.2
4.2
Sold By
QualityPcParts․com [Expedited] ⓐVerified Seller ✅
Mateo National Wholesale LLC
Amazon.com
Amazon.com
Amazon.com
GeekTown (Daily Expedited Shipping) ✅
power supply design
Full Modular
Full Modular
Full Modular
Full Modular
Full Modular
Full Modular
connector type
PCI Express
PCI Express
ATX
ATX
form factor
EPS12V
EPS12V
ATX
ATX
cooling method
Air
Air
Air
Air
Air
Air
fan count
1
1
1
1
1
1
wattage
850 watts
850 watts
850 watts
850 watts
1000 watts
750 watts

From the manufacturer

RM850x
RM850x
RM850x
RM850x
RM850x
RM850x

What's in the box

  • RM850x 80 PLUS Gold Fully Modular ATX Power Supply
  • ATX CABLE 24-PIN (20+4)
  • 2 EPS/ATX12V CABLE 8-PIN (4+4)
  • 3 PCIe CABLE 8-PIN (6+2)
  • 2 SATA CABLE (3 SATA)
  • SATA CABLE (4 SATA)
  • 2 PERIPHERAL CABLE (4-PIN)
  • FLOPPY DRIVE ADAPTER (4-PIN)
  • Looking for specific info?

    Product information

    Technical Details

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    Additional Information

    Warranty & Support

    Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
    Product Warranty: For warranty information about this product, please click here

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    Corsair

    Corsair RMX Series, RM850x, 850 Watt, 80+ Gold Certified, Fully Modular Power Supply (Low Noise, Zero RPM Fan Mode, 105°C Capacitors, Fully Modular Cables, Compact Size) Black


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    Product guides and documents

    Product Description

    Corsair RM850x series power supplies are built with the highest quality components to deliver 80 PLUS Gold efficient power to your PC. Using only Japanese 105 Degree C capacitors, users can depend on an RM850x PSUs' long life and reliability, backed by a ten year warranty. Zero RPM Mode means an RM850x series PSU is virtually silent at low and medium loads, and even at maximum power, a low noise fan ensures quiet operation. Fully modular cables make PC builds and upgrades easy, as you only need to install the cables your system requires. Quiet, efficient and dependable, an RM850x PSU has everything you need to power your high performance PC for years to come.

    Customer reviews

    4.8 out of 5 stars
    4.8 out of 5
    12,921 global ratings

    Customers say

    Customers like the quality, noise level, and ease of installation of the power supply. They mention that it's a high quality, solid unit, and reliable power supply that provides ample power to the cpu and gpu. They appreciate the value, modularity, and design of the product. Opinions are mixed on performance.

    AI-generated from the text of customer reviews

    461 customers mention329 positive132 negative

    Customers like the quality of the power supply. They say it's a high quality, solid unit, and reliable. They also say it has 80+ Gold certification and 850W power output. Customers also say the power adapter has no problems handling 750 watts sustained. They mention that the cable management is insane and the cables are much easier to maintain.

    "These power supplies are extremely well-built and come with a 10 year warranty...." Read more

    "...Very reliable, very stable, and barely audible even with your ear near it. I highly recommend Corsair's PSUs." Read more

    "...installation was easy enough, and this PSU has more than enough connections for most applications...." Read more

    "...ports (My board is a ASUS Crosshair X670E) and this PSU does not include the adapter for this plug, Although it's not necessary to power the board...." Read more

    244 customers mention212 positive32 negative

    Customers like the noise level of the system power device. They say it is ridiculously quiet and barely audible.

    "...The fan often does not spin at idle and remains extremely quiet even when under near-full load...." Read more

    "...Very reliable, very stable, and barely audible even with your ear near it. I highly recommend Corsair's PSUs." Read more

    "...The thing has been working flawlessly since, and is ridiculously quiet...." Read more

    "Its a great PSU, nice design, doesnt make much noise when the fan activates." Read more

    180 customers mention154 positive26 negative

    Customers like the power supply. They say it's a great product, with plenty of power to spare and a 5 year warranty. It's also a good addition to any high energy use PC, with its massive 800W of power. Customers also mention that it'll power their PC no problems and is energy efficient.

    "...The output is stable with minimal ripple on the 12V rail and acceptable 5V & 3.3V characteristics...." Read more

    "...The power supply itself seems to be fine, hasn't given me any issues, and is quiet, so from that perspective it's good...." Read more

    "...there have been no issues and the PSU is supplying ample power to the cpu and gpu for this old Dell system...." Read more

    "I mean it's a good powersupply, but the cables are so stiff it makes it hard to cable manage in a tight case...." Read more

    157 customers mention141 positive16 negative

    Customers find the installation of the power supply to be easy. They mention that it has everything they need for proper installation, making it easy to connect and manage the cables. The cables are flexible and easy to route, making wire management a breeze. The unit is quiet under load and boots right up with no issues.

    "...Cables are mostly flexible & easy to route, though the 24-pin ATX connector's capacitors do mildly complicate cable management moreso than with..." Read more

    "...The installation was easy enough, and this PSU has more than enough connections for most applications...." Read more

    "...Everything runs flawlessly, simple to install with a focus on aesthetics and the cable management is insane - especially with that 5000d case...." Read more

    "So after using it and so far everything has been great it was easy to install and I can add what cables I wanted instead of tucking away ones I was..." Read more

    86 customers mention62 positive24 negative

    Customers like the value of the power supply. They say it's worth the higher price, a great modular PSU for the money, and saves them money over the bronze edition. Customers also mention that Corsair makes the best affordable high quality power supplies out there.

    "...I got this PSU because it was the best balance between quality and price I could find. The RM750x 80+ Gold Certified specifically...." Read more

    "...CONS- The price. It's a really nice price when on sale, but when not on sale, you can find some cheaper alternatives from non name brand..." Read more

    "...It's certainly not the most value option on the market at $120-- other products probably offer the same wattage, features, and durability-- but as..." Read more

    "Great modular PSU for the money, it’s Corsair, they’ve got a good reputation!" Read more

    68 customers mention68 positive0 negative

    Customers appreciate the modularity of the power supply. They say that the design makes it a great addition to any PC, and the setup makes for very clean builds. Customers also like the modular cable design and the fact that it only needs to plug in the cords that you intend to use.

    "...Its fully modular, meaning you can only attach the wires you need, which eases the strain of the cable management chaos...." Read more

    "...etc... the modular set up was perfect. I simply plugged one thing back in after the other, then 4 screws to mount the power supply into the case...." Read more

    "...The modularity is great - I have about 1/2 the amount of cables routed through my case now...." Read more

    "...Absolutely love the fully modular version and how I went from having what seemed like a hundred cable leads that I balled up in the bottom of my..." Read more

    63 customers mention63 positive0 negative

    Customers like the design of the power supply. They say it has a high end look and feel, and it comes with a well designed bag for the power accessories. The quality looks good, and is easy to install. However, some customers have reported issues with the built-in cables.

    "Its a great PSU, nice design, doesnt make much noise when the fan activates." Read more

    "...Everything runs flawlessly, simple to install with a focus on aesthetics and the cable management is insane - especially with that 5000d case...." Read more

    "...Looks great in all-black PC builds, if visible- Built in cables are well designed - the SATA cables, for example, have multiple connectors on..." Read more

    "...the difference in quality right out of the box, it just has a high end look and feel to it with the packaging and everything...." Read more

    337 customers mention220 positive117 negative

    Customers are mixed about the performance of the power supply. Some mention that it functions well, while others say that it stopped working or burned out components.

    "...The fan often does not spin at idle and remains extremely quiet even when under near-full load...." Read more

    "...The thing has been working flawlessly since, and is ridiculously quiet...." Read more

    "...About 5 months ago, my PSU began having problems and would randomly shut off, I contacted customer support and let them know, they replied fairly..." Read more

    "...This power supply boasts a fan system that doesn't run unless it really needs to...." Read more

    good experience, probably not best value though
    4 Stars
    good experience, probably not best value though
    Used for my first PC build almost a year ago and have had no problems. It's certainly not the most value option on the market at $120-- other products probably offer the same wattage, features, and durability-- but as you can tell by the rest of the build, I'm a corsair shill.I realized after the fact that modularity in a power supply isn't really worth it unless you're working with an absolutely tiny case, which the Define Nano S is certainly not. I probably would have gone with a semi modular model in hindsight. In any case, the product comes with a ton of cables, pretty much all of which I will never use.Literally silent-- the fan is supposed to turn on at high loads according to an included fan curve graph, but the only time I've ever seen it spinning is for a few seconds when booting. I have read lots of forum posts online where people think it's broken because it just won't spin under load. Good thing too-- my GPU fan clearance is shockingly tight and it needs all the cool air it can get. I guess demanding games and even 3DMark Time Spy Extreme don't even draw enough watts to warrant active PSU cooling for a casual user like me.
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    Top reviews from the United States

    Reviewed in the United States on December 8, 2023
    Size: RM850XPattern: Power SupplyVerified Purchase
    Reviewed in the United States on November 28, 2023
    Size: RM750xPattern: Power SupplyVerified Purchase
    Reviewed in the United States on March 23, 2021
    Size: RM750xPattern: Power SupplyVerified Purchase
    Reviewed in the United States on December 4, 2023
    Size: RM850XPattern: Power SupplyVerified Purchase
    Reviewed in the United States on November 5, 2023
    Size: RM850XPattern: Power SupplyVerified Purchase
    One person found this helpful
    Report
    Reviewed in the United States on December 14, 2020
    Size: RM1000xPattern: Power SupplyVerified Purchase
    One person found this helpful
    Report
    Reviewed in the United States on March 28, 2021
    Size: RM750xPattern: Power SupplyVerified Purchase
    2 people found this helpful
    Report
    Reviewed in the United States on March 8, 2021
    Size: RM850XPattern: Power SupplyVerified Purchase
    5 people found this helpful
    Report

    Top reviews from other countries

    Translate all reviews to English
    Abelardo Ortiz
    5.0 out of 5 stars Joya
    Reviewed in Mexico on October 25, 2023
    Size: RM650xPattern: Power SupplyVerified Purchase
    Ariel W
    5.0 out of 5 stars Corsair RM750x 750 Watt 80+ Gold Power Supply - Quiet and Efficient Performance!
    Reviewed in Canada on August 2, 2023
    Size: RM750xPattern: Power SupplyVerified Purchase
    One person found this helpful
    Report
    Leong T.
    5.0 out of 5 stars Excellent Performance and Silent Operation, with a Minor Initial Odor
    Reviewed in Canada on May 26, 2023
    Size: RM1000xPattern: Power SupplyVerified Purchase
    Aldo
    5.0 out of 5 stars Recomendada
    Reviewed in Mexico on August 27, 2023
    Size: RM850XPattern: Power SupplyVerified Purchase
    Esteban
    5.0 out of 5 stars Calidad ante todo
    Reviewed in Mexico on February 26, 2021
    Size: RM750xPattern: Power SupplyVerified Purchase