CORSAIR RM850x Fully Modular ATX Power Supply - 80 Plus Gold - Low-Noise Fan - Zero RPM - Black
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Availability:
Only 4 left in stock, order soon!
Arrives
May 8 – May 10
Style: RMx (2021)
Size: 850W
Features
- Fully Modular: Only connect the cables your system needs, making clean and tidy builds easier.
- 135mm Magnetic Levitation Fan: Utilizes a magnetic levitation bearing and custom engineered rotors for high performance, low noise, and superior reliability.
- EPS12V Connector: For wide compatibility with modern graphics cards and motherboards.
- 100% All Japanese 105C Capacitors: Premium internal components ensure unwavering power delivery and long-term reliability.
- Modern Standby Compatible: Extremely fast wake-from-sleep times and better low-load efficiency.
- 80 PLUS Gold Certified: High efficiency operation for lower power consumption, less noise, and cooler temperatures.
Description
CORSAIR RM850x Series fully modular power supplies with EPS12V connectors are built with the highest quality components to deliver 80 PLUS Gold efficient power to your PC. RM850x PSUs use only Japanese 105°C capacitors, for long life and reliability backed by a ten-year warranty. A 135mm magnetic levitation bearing fan ensures high performance coupled with low noise.
Model Name: RM850X
Brand: Corsair
Compatible Devices: Personal Computer
Connector Type: ATX
Output Wattage: 850
Form Factor: ATX
Wattage: 850 watts
Cooling Method: Air
Item dimensions L x W x H: 6.3 x 5.91 x 3.39 inches
Item Weight: 1.7 Kilograms
Compatible Devices: Personal Computer
Connector Type Used on Cable: ATX
Output Wattage: 850
Form Factor: ATX
Wattage: 850 watts
Cooling Method: Air
Power Supply Design: Full Modular
Number of Fans: 1
Fan Size: 135 Millimeters
Maximum Input Voltage: 240 Volts
Minimum Input Voltage: 100 Volts
System Bus Connector Type: EPS
Item Dimensions: 6.3 x 5.91 x 3.39 inches
Item Weight: 1.7 Kilograms
Model Name: RM850X
Brand: Corsair
Manufacturer: Corsair
UPC: 840006604839
Mfr Part Number: CP-9020200-NA
Model Number: CP-9020200-NA
Warranty Description: 10 year manufacturer
Unit Count: 1.0 Count
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
May 8 – May 10
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Style: RMx (2021)
Size: 850W
Works great
Reviewed in the United States on April 17, 2026 by Alannis J.
Style: RMx (2021)
Size: 850W
I recently purchased the Corsair RM850x (2021) Fully Modular ATX Power Supply, and I must say, I am extremely impressed with its performance and features. Corsair has always been known for delivering high-quality power supplies, and the RM850x is no exception. Here's my review of this remarkable power supply. First and foremost, the efficiency of the RM850x is outstanding. With its 80 PLUS Gold certification, it delivers excellent power efficiency, ensuring that my system consumes less energy and runs cooler. This not only helps in reducing electricity bills but also contributes to the overall longevity and reliability of my system. The fully modular design of the RM850x is a game-changer. It allows for easy cable management, as I can connect only the cables I need and keep the rest neatly stored away. This not only enhances the aesthetics of my build but also improves airflow within the case. The modular design also makes installation a breeze, as I can effortlessly connect the required cables without any clutter or hassle. One of the standout features of this power supply is its low-noise fan. The fan operates silently under regular loads, and I barely notice its presence. It only kicks in when the system is under heavy load, and even then, the noise levels are impressively low. The Zero RPM fan mode is particularly noteworthy, as it ensures complete silence during idle or low-power usage scenarios. This is a great feature for those who prefer a quiet computing experience. The build quality of the RM850x is top-notch. The unit feels solid and durable, and the black finish gives it a sleek and premium look. The cables provided are of high quality and have a premium feel as well. The power supply comes with all the necessary protections, including over-voltage, under-voltage, over-power, over-temperature, and short-circuit protection, ensuring the safety of my components. In terms of power delivery, the RM850x handles my system with ease. It provides ample power for my high-end components, including a demanding CPU and a high-performance graphics card. The voltage regulation is excellent, and I have not encountered any stability issues or power-related problems since installing this power supply. One minor drawback of the RM850x is its size. It's a bit larger than some other power supplies on the market, so it might not fit into smaller PC cases. However, in most standard ATX cases, this should not be an issue. Overall, the Corsair RM850x (2021) Fully Modular ATX Power Supply is an exceptional product that delivers on all fronts. Its efficiency, modular design, low-noise fan, and solid build quality make it a reliable choice for any PC enthusiast or gamer. With its impressive performance and thoughtful features, the RM850x is definitely worth the investment for those looking for a high-quality power supply to power their systems. I highly recommend the Corsair RM850x to anyone in need of a powerful, efficient, and silent power supply for their PC build. Corsair has once again raised the bar with this outstanding product.
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Reviewed in the United States on July 14, 2023 by Tanner Henry
Style: RMx (2024) - ATX 3.1
Size: 850W
my 2nd corsair psu. upgraded wattage and to atx 3.1 for a 5070ti. never had any problems with this one or my prior rm750x. great stable supplies at a reasonable price.
Reviewed in the United States on April 18, 2026 by joe c
Style: RMx (2021)
Size: 850W
The media could not be loaded. First and foremost, this power supply delivers rock-solid and stable power to my system. With an 80 PLUS Gold certification, it's highly efficient and ensures that my components receive clean and consistent power. Whether I'm gaming, video editing, or running demanding applications, I've never experienced any issues with power delivery. One of the standout features of the RM850x is its low-noise fan. Even under heavy loads, the fan remains incredibly quiet, ensuring a peaceful computing experience. I no longer have to worry about my power supply adding to the noise levels in my workspace. It offers efficient power delivery, exceptional cable management options, and silent operation, thanks to the low-noise fan and zero RPM fan mode. Whether you're a gamer, content creator, or PC enthusiast, this power supply won't disappoint. It's become an integral part of my system, and I can wholeheartedly recommend it to anyone seeking a power supply that combines performance, silence, and quality in one package. Corsair has once again delivered a product that exceeds expectations.
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Reviewed in the United States on September 22, 2023 by Fabio Maia
Style: RMx (2021)
Size: 850W
No problems whatsoever with this unit.
Reviewed in the United States on April 10, 2026 by Ironmike
Style: RMx (2021)
Size: 850W
Top of the line, supports the 12v connector we all love and hate.
Reviewed in the United States on January 29, 2026 by McDaniel
Style: RMx (2021)
Size: 850W
I originally bought this for a browsing only PC and it worked perfectly. Modular connections and the wires that came with were perfect. I had to buy an extension to get to the Motherboard which was on the opposite side! Wish they included that. But it was just few $. Unit itself worked from get go. The fan noise was barely present! If you have nice ventilation, especially you have bottom clearance for air circulation, you shouldnt see the fan spinning much. Lets talk about support. I switched this unit for 1200W (same brand) as I had to upgrade my graphics card and add few HDD. Kept it in its box and after 6 months, when I put it to a new MB/ATX, it wont power up!! Go figure! Probably a faulty unit? Contacted Corsair via phone/email and after few initial hiccups (once their Tech Support got involved) they asked for few pictures, videos and RMA was triggered! Shipped the unit with their label and my new one is enroute! After googling I found out their 2021 model had some such failures for other people. I would still recommend this model, but get the latest one. Whats better than the best PSU, you ask? - Best Customer Support & RMA process. Anyone can say 50 years guarantee, but to stand behind that and replace as promised, thats the brand you should buy.
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Reviewed in the United States on May 8, 2023 by BV
Style: RMx (2021)
Size: 850W
I bought the RM850x because of i) its high-quality clean power (verified by 3d party reviews), ii) reasonable price, iii) large number of cable ports, and iv) support from Corsair. I had been buying SuperFlower or Seasonic made PSU’s from EVGA but given events of the last year I’m not sure EVGA will remain in business for the next 10 years to support a warranty. My only real gripe is that there is no selection switch for the fan zero-rpm eco mode. Heat is the enemy of electrical component longevity; a ML fan is virtually silent at low rpm and I’d rather have it always on. However, it seems the big players in the industry would rather dumb-down the marketing of PSU’s to focus primarily on quietness and efficiency. The in-cable capacitors can be a minor annoyance; but if they are responsible for the very low ripple then I am happy to have them. Lastly, for something marketed as a premium product the packaging/accessories were rather cheap. Weak box and interior protection, no cable bag, no start-up test plug, and no manual. Makes me wonder where else Corsair cut corners on this product that I can’t see. But overall, I’m happy with the purchase and would recommend this product.
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Reviewed in the United States on July 18, 2023 by Mike