CORSAIR RM850x Fully Modular ATX Power Supply - 80 Plus Gold - Low-Noise Fan - Zero RPM - Black
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This item is eligible for return within 30 days of receipt
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Availability:
Only 3 left in stock, order soon!
Arrives
Mar 20 – Mar 24
Recently Viewed
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
Brand: Corsair
Series: RM850X
Item model number: CP-9020200-NA
Item Weight: 3.74 pounds
Product Dimensions: 6.3 x 5.91 x 3.39 inches
Item Dimensions LxWxH: 6.3 x 5.91 x 3.39 inches
Color: Black
Manufacturer: Corsair
Date First Available: June 22, 2022
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Mar 20 – Mar 24
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
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
This is the first PSU I ever bought for a PC, and first time installing one in a new case to move my build over from an old. My old PSU was one that came with my pre-built PC which was 500w. It started making some grinding and humming noises for a while and I also upgraded my cooling method for my CPU. I originally had a Thermalake CPU Cooler which I hated because it always got so hot. But I had to upgrade my PSU because my old one was not giving enough power. My RGB Fans and my Liquid Cooler RGB Lights would either dim or turn completely off and sometimes the PSU would get even louder like it was working a lot harder to keep the power flowing which caused a lot of performance issues. I. Love. Everything about this PSU, it's so much quieter, my computer is performing like new again, and all of my lights are staying on with no issue. I took online advice and made sure not to go cheap with this kind of thing because one cheap psu, if it's bad, it can go from cheap to expensive if you know what I mean. Your entire PC can fry which would make every component unsalvagable which means replacing the entire thing! My old PSU has been making the noises at least for over a year, I didn't think anything of it. I kept up with cleaning and maintaining it every 3 to 6 months to make sure dust never accumulated enough to cause issues. I'm still fairly new to this PC building thing but as far as my experience with this PSU so far, it's great, it's quiet, and it made my pc performance so much better. Take the advice like I did, don't go cheap with something like this. You won't regret it. The heart of your pc deserves the best for its lifespan.
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Reviewed in the United States on August 15, 2022 by Kindle Customer
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 (2024) - ATX 3.1
Size: 850W
Relatively easy to install, and it’s performance is as expected
Reviewed in the United States on December 16, 2025 by Nelson Tovar
Style: RMx (2021)
Size: 850W
RM650x, 750x, 850x, SF600, SF1000, the PSUs for my current builds. Without a doubt, the RMX Series will protect and deliver clean power to your investment. Don't be builder that loses a system to a cheap PSU. With a 10 year warranty, you know the RMX was built to last. I say go one step further, and protect it all with a decent battery back up (UPS).
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Reviewed in the United States on December 6, 2025 by Ordinary average guy
Style: RMx (2021)
Size: 850W
I love that this is modular no need to have all the extra cables just shoved into the power supply bay. This makes builds really clean, this has been in my PC for at least 6 months now and I have no complaints I actually use this to replace a failed power supply that was an older one I had. This came with every connector needed except for a modern Nvidia GPU connector. Luckily I already had one on hand since I had to adapt my old power supply but being purchased in 2025 it should have been something that comes in the box
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Reviewed in the United States on March 3, 2026 by Nathaniel murray
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