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The CORSAIR RM850x is a fully modular, low-noise ATX 3.1 power supply with Cybenetics Gold efficiency and native 12V-2x6 connector for latest GPUs.
Categories : Series
SKU : POR-SER-191
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The CORSAIR RM850x Fully Modular Low-Noise ATX Power Supply delivers quiet, dependable power for your PC. With Cybenetics Gold efficiency (up to 91%), it reduces heat and noise while keeping your system running at peak performance. Its fully modular cabling lets you connect only the cables you need, making builds clean and straightforward.
Compliant with Intel's ATX 3.1 standard, the RM850x supports the latest PC hardware, including transient power spikes up to 2x total power. The native 12V-2x6 connector connects directly to modern graphics cards without an adapter, ensuring stable power delivery and easier cable management.
The 140mm rifle bearing fan uses a zero-RPM mode that keeps the fan completely silent at low and moderate loads. This ensures a quiet computing experience, whether you're working, gaming, or creating content.
Built with 100% Japanese 105°C-rated electrolytic capacitors, the RM850x provides long-term reliability and excellent electrical stability. The embossed cables are ultra-flexible, simplifying routing and reducing clutter.
The CORSAIR RM850x is an ideal choice for high-end gaming PCs and workstations needing clean, powerful, and reliable energy delivery.
Fully modular cabling reduces clutter and simplifies installation, allowing you to connect only what you need.
Cybenetics Gold certification ensures up to 91% efficiency, lowering power consumption and heat output.
Native 12V-2x6 connector provides direct, stable power to modern GPUs without adapters.
Fan: 140mm Rifle Bearing, Zero RPM Mode
Color: Black
Model: RM850x
Modular: Fully Modular
Wattage: 850W
Connector: Native 12V-2x6
Capacitors: 100% Japanese 105°C-rated electrolytic capacitors
Efficiency: Cybenetics Gold (up to 91%)
Form Factor: ATX
Product Type: ATX Power Supply
ATX Compliance: ATX 3.1, PCIe 5.1
Seller: PortSide Gear
MPN: RM850x
The RM850x is engineered with a robust +12V single-rail design that delivers stable power to demanding CPUs and GPUs. Its modular flat cables are easy to bend and route, allowing for clean, organized builds. The PSU also includes a 10-year warranty, reflecting its long-term reliability. For PC builders seeking a balance of performance, quiet operation, and future-proof connectivity, the RM850x is a solid choice.
The RM850x features a zero RPM fan mode that is default enabled. To disable it, you can use the dedicated fan control button on the back of the PSU, if available, or adjust settings via Corsair iCUE software if the PSU is compatible. In many models, the zero RPM feature can be toggled via a physical switch or through the included software.
The fan may spin continuously under high load or if the temperature rises significantly. If you want to enable zero RPM mode, ensure the mode is activated and that the power supply is operating under light to moderate load. If the issue persists, check if the fan control switch is set to 'Auto' and not 'Always On'.
Yes, it comes with a native 12V-2x6 cable for connecting to the latest graphics cards, ensuring you don't need an adapter.
Replaced an old PSU with this RM850x and it's been rock solid. Whisper quiet, fully modular, and the native 12V-2x6 connector is perfect for my RTX 4090. Zero coil whine, and the Cybenetics Gold rating is legit – my system runs cooler and more stable. A bit pricey, but for a top-tier PSU, it's worth it.
This PSU is fantastic. It's so quiet I can't even hear it over my fans, and the modular cables make cable management easy. I've been running it for months with heavy gaming and rendering, no issues at all. Highly recommend.
Solid power supply, very quiet, and the build quality feels premium. However, the included cables are quite stiff, so routing them in a small case requires some patience. Also, the 12V-2x6 connector is a bit bulky but works fine. Overall, a great investment for a high-end build.
I bought this specifically for the native 12V-2x6 connector so I didn't have to use an adapter. It's been flawless since day one. The fan is silent, and the efficiency is top-notch. My system idles at lower power draw than before. This is my second Corsair PSU, and they never disappoint.
Very good PSU overall. It's quiet and provides clean power. The only reason I'm not giving 5 stars is because the price is high, and the cables, while modular, are a bit too long for my mid-tower case. But performance-wise, it's excellent.
I was skeptical about spending so much on a PSU, but this one is worth every penny. My system is dead silent even under load. The fully modular design helped me get a clean build. Also, the fan rarely spins up, and when it does, it's barely audible.
I'm running a 14900K and 4080 Super with this, and it handles everything with ease. The native 12V-2x6 is great, no adapter needed. I've also tested it with a power meter, and efficiency matches the Cybenetics rating. Highly recommended.
It's a solid power supply, but I feel like I paid extra for the brand. The performance is great – quiet, stable, and clean power. The cables are okay, but not the softest. If you can get it on sale, go for it.
Installed this in my new build. The quality is obvious – heavy, well-built, and install was straightforward. It powers my 7950X and 7900XTX without breaking a sweat. The fan doesn't spin at idle, so it's silent. Very happy!
My previous PSU died and took a GPU with it, so I decided to get a quality unit. This Corsair is a beast. I like the 10-year warranty, gives me peace of mind. The modular cables are nice, but I wish they were a bit more flexible. Still, 5 stars.
Overall, a great PSU. It's quiet, efficient, and the 12V-2x6 connector is a plus. But the cables are a bit stiff, and the EPS cable is longer than needed for most builds. If you have a case with good cable management, it's fine. I'd buy it again.
