RM850x Fully Modular Low-Noise ATX Power Supply – ATX 3.1 Compliant – PCIe 5.1 Support – Cybenetics Gold Efficiency – Native 12V-2x6 Connector – Black

Corsair RM1000x – Reliable, Efficient, and Silent Powerhouse The Corsair RM1000x is a top-tier 1000W power supply that delivers exceptional performance, efficiency, and near-silent operation. Whether you're building a high-end gaming rig, a workstation, or a power-hungry overclocked system, the RM1000x stands out as one of the best choices in its class. 80 PLUS Gold Efficiency – Stable and Power-Efficient One of the key highlights of the RM1000x is its 80 PLUS Gold efficiency rating, ensuring that power delivery remains stable and efficient, minimizing wasted energy and heat output. This translates to lower electricity costs and reduced thermal stress on your components, making it a great long-term investment. Premium Components – Built to Last Corsair has packed the RM1000x with high-quality, 100% Japanese capacitors, which are rated for 105°C operation, ensuring durability and longevity. This power supply is built to handle continuous heavy loads while maintaining excellent reliability, making it ideal for enthusiasts, overclockers, and professionals who need uncompromising performance. Silent Operation – Zero RPM Mode A standout feature is the Zero RPM fan mode, which keeps the fan completely off during low to medium loads, resulting in silent operation. Even under heavy workloads, the 140mm fluid dynamic bearing fan runs whisper-quiet, ensuring a distraction-free experience whether you're gaming or working. Fully Modular – Clean and Hassle-Free Cable Management The fully modular design makes cable management a breeze. You only need to plug in the cables required for your build, reducing clutter and improving airflow inside your case. The included sleeved cables are of high quality and provide a clean, professional look. Reliable Power Delivery – Handles Any High-End Build With 1000W of power and a strong +12V rail, the RM1000x can handle high-end GPUs like the RTX 4090, AMD Radeon RX 7900 XTX, and multi-GPU setups with ease. It’s also perfect for overclocking, ensuring stable voltage delivery even under extreme loads. Final Verdict: 10/10 – A Power Supply You Can Trust The Corsair RM1000x is an outstanding PSU that combines high efficiency, silent operation, premium components, and excellent power delivery. Whether you're running a high-end gaming PC, an enthusiast workstation, or an overclocked rig, this PSU provides the stability and reliability needed for long-term performance. If you need a 1000W PSU that delivers on all fronts, the Corsair RM1000x is one of the best choices on the market. Highly recommended! 🔥💪

I bought this Corsair RM1000x ATX 3.1 (2024) PSU to replace a faulty ASRock PSU. As one other review mentioned, the Cybenetics rating on the box for power efficiency has been recently updated from Gold to Platinum, which will help keep long term energy costs down for people who live in areas with expensive electricity. When unboxed, the power supply feels and looks like a premium product, and indeed it is. The modular cables in the box all come with individually sleeved wires, and the 12V 2x6 connector and ATX 24 pin connectors come with clamshell style cable combs preinstalled, which seems to be a newer development with this unit. I looked at multiple tech site reviews of this power supply and the only one with cable combs I found was the Kit Guru review, and those were manually installable traditional style combs. The cables did have a bit of a petrochemical smell to them, but it was far better than the ASRock unit I replaced. The cables on the RM1000x are also longer and more flexible than on the ASRock unit, making routing in my mid-tower case easier, specifically for the CPU (length) and ATX 24 pin (flexibility). The power supply performs exceptionally well, making absolutely no coil whine noise at any load, and works completely silently at loads below 500 watts. The fan control knob on the back of the unit comes out of the box set to 0 RPM low noise mode, leaving the fan off until the aforementioned 500 watt limit is exceeded. If you don't care about 0 RPM low noise mode, you can adjust the knob clockwise until it clicks, at which point you're manually controlling the fan, allowing you to set a constant fan speed anywhere in the fans RPM range. One thing to note is that the 12V 2x6 connector that comes in the box only has 2 of the four sense pins, but this is totally fine, as it powers my RTX 5080 without issue, so don't be concerned that two sense wires are "missing". I was extremely lucky to get this unit at a cheaper price only a day before it raised to its current price, but even around the $200 mark, this power supply is worth the price. Overall I give this power supply a 9/10, and only because I don't like that the fan is gray instead of black, which honestly is likely a complete non-issue for most people.

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.

Very sturdy, solidly built power supply. Absolutely quiet, no coil whine, been performing flawlessly in my new AM5 PC with a 5070 Ti. I like the new 12VHPWR cable that connects directly to the GPU with a single connector. I vaguely remember hearing stories about problems with that connector and power hungry gpus but it looks like it's less of an issue now and is working fine for me. The included cables are all high quality as well. I also like the fan control knob, it's a very thoughtful feature, I don't see that on many PSUs and I love physical controls. I believe I kept mine on silent mode but either way I have not had any reason to change it. Overall, no complaints at all other than feeling like maybe I should have gone with 850w but I think 750w should be more than enough for the life of my PC.

Corsair RM1000x (2024/2025 Refresh) I’ve been using the RM1000x series for years, but this latest refresh is a must-buy if you're running high-end hardware. Here is why this specific model is a step above the rest: The 12V-2x6 Safety Upgrade: This isn't just a rebranded cable. The 12V-2x6 standard fixes the "melting" issues from the older 16-pin designs by using shorter sense pins. If the cable isn't 100% seated, the PSU simply won't send full power, protecting your GPU from thermal damage. It's a huge peace of mind for anyone with a 40-series or 50-series card. Which was the exact reason I purchased it. If you are going to spend the money to buy the latest and greatest video card then by all means don't skimp on the power. Tactile Cooling Control: The Manual Fan Override Knob is a game-changer. It’s located right on the back panel next to the power plug, so it's fully accessible from outside your case. You can leave it on Zero RPM mode for total silence during work or manually crank it up to 100% during a marathon gaming session to keep the internals chilled. It's so satisfying to know that the fan that is inside PSU is not only running but as fast as you want it to because you can dial it in to your needs. Premium Internals: It uses 100% Japanese 105°C-rated capacitors, which are the highest tier for longevity. It’s Cybenetics Gold certified for efficiency and holds an A- noise rating, so even when it is working hard, it stays whisper-quiet. Build-Friendly Cables: The cables are "embossed," making them much more flexible and easier to route through tight spaces than the old stiff, sleeved versions. The Pro Tip: Register this PSU on the Corsair site immediately. It comes with a 10-year warranty. Corsair’s support is top-tier, and with a decade of coverage, this is likely the last PSU you’ll need to buy for the next several builds.

The description is somewhat misleading, as the 2024 refresh is a platinum power supply masquerading as gold (lower). The box and cybenetics website confirm it. That is a great performance anywhere near the price point. Well, always nice when a product delivers over the target spec rather than under, so kudos for Corsair. From the user perspective, the psu is great, runs rtx 5090 with no or minimal noise, the cables are individually sleeved and of high quality you'd expect from Corsair. This also helps quickly check the 12V-2x6 connector by hand to make sure no individual wire is super hot. The 12V-2x6 connector has a good latch and locks solidly. Clean, minimal packaging, easy to install. There are enough connectors to power almost any reasonable system. Overall, if you have gotten to this review, I strongly recommend buying it for most any use case in 2025.

Nice psu with a quiet fan that is adjustable and makes low noise and works well. Good cables too

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.