CORSAIR RM850x Fully Modular Low-Noise ATX Power Supply – ATX 3.1 Compliant – PCIe 5.1 Support – Cybenetics Gold Efficiency – Native 12V-2x6 Connector – Black
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Availability:
Only 2 left in stock, order soon!
Arrives
Jun 16 – Jul 29
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Style: RMx (2024) - ATX 3.1
Size: 850W
Features
- Fully Modular: Reliable and efficient low-noise power supply with fully modular cabling, so you only have to connect the cables your system needs.
- Cybenetics Gold-Certified: Rated for up to 91% efficiency, resulting in lower power consumption, less noise, and cooler temperatures.
- ATX 3.1 Compliant: Compliant with the ATX 3.1 power standard from Intel, supporting PCIe 5.1 and resisting transient power spikes.
- Native 12V-2x6 Connector: Ensures compatibility with the latest graphics cards with a direct GPU to PSU connection no adapter necessary.
- Embossed Cables with Low-Profile Combs: Sleek, ultra-flexible embossed cables look great and make installing and connecting the RMx a breeze.
Description
CORSAIR RMx Series Fully Modular Low-Noise Power Supplies deliver quiet, dependable power with Cybenetics Gold efficiency to your PC. Fully modular, ultra-flexible embossed cables make PC builds easy, as you connect only the cables your system requires. Compliant with the ATX 3.1 power standard from Intel®, RMx PSUs have the connections needed to power today’s demanding PC hardware including a native 12V-2x6 connector. 100% Japanese 105°C-rated electrolytic capacitors deliver fantastic electrical performance, while a 140mm FDB fan provides low noise cooling. Backed by a ten-year warranty, RMx PSUs are the gold standard for many years to come.
Model Name: RMx
Brand: Corsair
Compatible Devices: Monitor
Connector Type: ATX
Output Wattage: 850 Watts
Form Factor: ATX
Wattage: 850 watts
Cooling Method: Air
Item dimensions L x W x H: 2.3 x 3.39 x 5.91 inches
Item Weight: 3.9 Pounds
Brand: Corsair
Series: RMx
Item model number: CP-9020270-NA
Item Weight: 3.9 pounds
Product Dimensions: 2.3 x 3.39 x 5.91 inches
Item Dimensions LxWxH: 2.3 x 3.39 x 5.91 inches
Color: Black
Manufacturer: Corsair
Date First Available: October 2, 2024
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Jun 16 – Jul 29
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 (2024) - ATX 3.1
Size: 850W
For as long as I've been building my own computers - more than twenty-five years now - I've used Corsair power supplies. I don't necessarily think they are better than any other brand, but they've never let me down, despite all my computers generally running 24/7 in dusty, sometimes humid, sometimes 90F environments. I purchased this not because my old Corsair supply failed, but because I was installing a 5070Ti and wanted higher output as a result - the 650W would have barely been suitable. Swapping supplies was dead simple; the old one slotted in place of my old RM650x, and all I needed to do is replace the old power cable from the RX470 with the newer 12V-2x6pin. I have all Cablemod Sleeved cables and debated replacing the the new 12-pin connector with a sleeved variant, but it's so flexible and clean looking I decided the Corsair one was just fine. I've been running for about three months now without any issue. Obviously not much time on a PSU but I doubt I'll have problems. As an aside, this one has a variable fan speed knob. So far as I can tell, if you leave it off it will just run in normal, automatic mode, whereas if you use the knob it will instead always run at a certain speed. I think, I'm not totally clear on it. I just keep the knob off - my system is already very quiet and I don't think I've ever heard the PSU fan turn on even with my old supply, much less this newer one. As my mobo doesn't support PCIe 5.1, I can't comment on that part of the component. I would definitely recommend this RM850x, and would recommend Corsair in general, so far as PSUs are concerned. They seem very solid and well-made, and I've never been disappointed by them in the past.
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Reviewed in the United States on December 12, 2025 by AC
Style: RMx (2024) - ATX 3.1
Size: 850W
I bought one years ago and lightning struck my house. This power supply took a jolt and kept on working. So, I bought another one (this one, lol). These power supplies are great. Easy to setup and use. Pretty easy cable management do to it being fully modular. Its very quiet except when you adj7st the fan to high. Its not l9ud, but you can definitely tell it's moving air, lol. The nob on the back adjusts the fan speed if you want more cooling. Well worth the buy.
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Reviewed in the United States on September 5, 2025 by IamKraZ
Style: RMx (2024) - ATX 3.1
Size: 850W
Compré la Corsair RM850x esperando lo mejor de una de las fuentes más aclamadas de esta gama, y la verdad es que mi experiencia se divide entre una PSU de 5 estrellas y una experiencia de unboxing de 3 estrellas. El Dilema del Packaging ¡¿Qué pasó Corsair?! Para una fuente de este precio y prestigio, la presentación es sorprendentemente simple. La fuente viene en una bolsa plástica (suficiente, pero decepcionante) y los cables, en lugar de venir en una cómoda bolsa de tela (como por ejemplo la Thermaltake GF1), vienen sueltos. Esto me obliga a guardar la caja completa o tener los cables desorganizados, lo cual es un inconveniente. Aparte de esto, trae los 4 tornillos de chasis y unas pocas bridas. Calidad de Cables y Cable Management A pesar del packaging, la calidad funcional de los cables es muy buena: Su flexibilidad es buena, son lo suficientemente maleables para doblarlos y que mantengan su forma, facilitando mucho el orden y el aspecto limpio. No forman mucho bulto, lo cual es positivo para el panel trasero. Detalles Útiles: El conector 12VHPWR incluye una banda de seguridad que confirma que la conexión ha sido correcta y evitar el riesgo de falso contacto. Además, me gustó mucho que varios cables incluyen esas piezas plásticas móviles para mantener los cables alineados y prolijos. Otron punto a mejorar: El conector de CPU de 8 pines viene unido. Si bien está muy bien para conectores 8 pines, el sistema para dividirlo en 4+4 pines me pareció delicado y poco práctico, ya que no se puede separar sin la ayuda de pinzas. Control de ventilador único (El Knob del Ventilador) La fuente es inaudible bajo cargas normales gracias al ventilador de 140 mm y el modo Zero RPM, esta versión incluye un control manual (knob) que es más que un simple interruptor pues permite: Usar el modo Zero RPM o fijar una velocidad mínima del ventilador desde 0% hasta 100%. Esto es útil si quieres forzar un flujo de aire adicional o si instalas la fuente con el ventilador hacia arriba y quieres mantenerlo funcionando siempre a bajas RPM. Conclusión: La RM850x es una fuente de poder de calidad técnica verificada por expertos. Si está dispuesto a pasar por alto la simpleza del packaging, los accesorios y el cableado (por eso 4 estrellas), estarás feliz con un componente duradero, extremadamente silencioso y con calidad comprobada. No deja de ser una buena opción pero recomiendo mirar otras alternativas en su gama y misma garantia.
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Reviewed in the United States on October 15, 2025 by JAIME TILANO JAIME TILANO
Style: RMx (2024) - ATX 3.1
Size: 850W
Rm850x is a great psu. only prolem was it opened and was missing one of the pcie power cables for my gpu. I ordered this one specifically becasue it comes with three 8 pin (6+2) cables which i need for my 3080. Rather than return it and wait I had to order a replacement cable for $15.
Reviewed in the United States on March 2, 2026 by _Bosse
Style: RMx (2024) - ATX 3.1
Size: 850W
An excellent PSU! Just visually you can tell it is miles nicer than the RM850e. Unfortunately, along with the better quality, it's significantly longer than the "e" and won't fit in my case. I like the Corsair modular cables on the "e" in my build, and these cables are the same. If only they could keep the better fan/bearing/caps on a PSU the size of the "e".
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Reviewed in the United States on January 18, 2026 by Customer Review
Style: RMx (2024) - ATX 3.1
Size: 850W
Perfect for my new computer that I underpowered and had performance issues with. Connections were easy to make with the modular cables. The inside of the chassis is much more organized, with improved airflow.
Reviewed in the United States on January 31, 2026 by Tony B.
Style: RMx (2024) - ATX 3.1
Size: 850W
BUEN PRODUCTO
Reviewed in the United States on February 17, 2026 by Alejandro Gonzalez
Style: RMx (2024) - ATX 3.1
Size: 850W
Installation instructions lacking. Overall functions as intended
Reviewed in the United States on January 30, 2026 by Amazon Customer