Corsair RMX White Series (2018), RM850x, 850 Watt, 80+ Gold Certified, Fully Modular Power Supply – White, 80 PLUS Gold

(10 customer reviews)


Series RMx
Brand Corsair
Connector Type ATX, EPS
Output Wattage 850
Form Factor ATX12V
Wattage 850 watts
Cooling Method Air
Item Dimensions LxWxH 6.3 x 5.91 x 3.39 inches
Item Weight 3.52 Pounds
Power Supply Design Full Modular

  • 80 plus gold Certified high efficiency operation for lower power consumption less noise and cooler temperatures
  • Tuned for Low noise operation a specially set fan curve ensures that even at full load fan noise is kept to a minimum
  • Zero rpm fan mode at Low and medium loads the cooling fan switches off entirely for near-silent operation
  • 100% all Japanese capacitors premium internal components ensure unwavering power delivery and long-term reliability
  • Fully modular flat cables flexible fully modular flat White cables for Easy cable routing



PRISTINE WHITE CASING Now available in an elegant white finish to make your build truly stand out. TUNED FOR LOW NOISE OPERATION A specially set fan curve ensures that, even at full load, fan noise is kept to a minimum. 80 PLUS GOLD CERTIFIED The RMx White can deliver power with over 90% efficiency, lowering energy consumption, noise, temperatures, and your power bill. 100% ALL JAPANESE CAPACITORS By using high-end electrolytic capacitors, the RM850x delivers the unwavering power and long-term reliability you’ve come to expect from a CORSAIR power supply. ZERO RPM FAN MODE At low and medium loads the RM850x’s cooling fan doesn’t spin until you need it, for near-silent operation. FULLY MODULAR, FLAT CABLES Flexible fully modular, flat white cables mean that you only connect the cables your system needs, making clean and tidy builds easier. TEN-YEAR WARRANTY CORSAIR offers a ten-year warranty on all RMx series power supplies, your guarantee of reliable operation that will last across several system builds. If you run into any problems during the installation or use of an RMx power supply, CORSAIR global customer support is ready to help. Manufacturer: Corsair. Manufacturer Part Number: CP-9020188-NA. Brand Name: Corsair. Product Series: RMx. Product Model: RM850x. Product Name: RMx White Series RM850x – 850 Watt 80 PLUS Gold Certified Fully Modular PSU. Product Type: Power Supply. [Technical Information] Specification Compliance: ATX12V/EPS12V. Efficiency: 90%. Number of Fans: 1. Modular: Yes. [Power Description] Number of +12V Rails: 1. Input Voltage: 120 V AC. 230 V AC. Output Voltage: 12 V DC @ 70.80 A. 3.3 V DC @ 25 A. 5 V DC @ 25 A. 5 V DC @ 3 A. 12 V DC @ 800 mA. Output Power: 850 W. [Physical Characteristics] Form Factor: Internal. Height: 3.4″. Width: 5.9″. Depth: 5.9″. [Miscellaneous] Package Contents: RMx White Series RM850x – 85

From the manufacturer

CP-9020188-NA RMx White Series RM850x 850 Watt 80 PLUS Gold Certified Fully Modular PSU

CP-9020188-NA RMx White Series RM850x 850 Watt 80 PLUS Gold Certified Fully Modular PSU


CP-9020188-NA RMx White Series RM850x 850 Watt 80 PLUS Gold Certified Fully Modular PSU

Additional information

Weight 3.52 kg
Dimensions 6.3 × 5.91 × 3.39 cm




Item model number


Item Weight

3.52 pounds

Product Dimensions

6.3 x 5.91 x 3.39 inches

Item Dimensions LxWxH

6.3 x 5.91 x 3.39 inches


80 PLUS Gold


110240 Volts



Date First Available

August 16 2018





10 reviews for Corsair RMX White Series (2018), RM850x, 850 Watt, 80+ Gold Certified, Fully Modular Power Supply – White, 80 PLUS Gold

  1. SafeguardSanakan

    Bit the bullet – but the system survivedI guess I got unlucky.When I was installing my original PSU, I noticed through the fan grate there was some grey material inside the unit. I guessed it was some sort of thermal paste or something, maybe even protective gel to prevent electrical arcing. The unit was completely factory sealed, never opened – and yet it had this grey, seemingly solidified goop in the bottom. It was a little weird, but I didn’t think much of it at the time.I’ll get back to this goop later on in my story.Corsair’s PSUs are rather reputable, and this one features a 10 year warranty. Unfortunately for me, my own power supply died about 2 weeks after installing it in my system. I heard a loud electric crack from my computer, and the entire system immediately shut off. Hitting the power button didn’t do anything.”Oh [censored]” is what exited my mouth, having a PSU die on you is VERY bad. Either only the PSU bit the bullet, or the PSU killed not only itself, but everything that was attached to it. Everything in your computer is connected to the power supply one way or another. Hundreds or thousands of dollars of damage could be on the line.Fortunately, only my PSU bit the bullet – it didn’t kill my entire system. After detaching it from my computer and plugging it into a wall, I hooked it up to my old PC and hit power. The PSU temporarily gave it enough power, but then made a clicking sound – I’m guessing some safety breaker in it was triggered, and the thing shut off.RMAing the PSU was reasonably easy, however from my experience the only way I could get Corsair to advance my RMA process was by calling their support center. I had to contact them twice on the phone before my RMA request was approved and I was able to ship the PSU to them – on my own dime, mind you. They don’t cover the cost of shipping back to them.I’m aware these large companies have lots of calls and tickets to deal with, but given that my RMA was only pushed along after phoning them twice, and taking nearly an hour in hold time/call time is unacceptable. Perhaps I had my problem during a bad week for Corsair, but the experience was still quite frustrating, especially when a brand new product goes bad.Fortunately, they shipped a new one to me the day they received my dead PSU – with 1 day expedited shipping! My new PSU was at my door the very next day after the broken one had arrived. So… I guess that makes up for the $17 I spent to ship the dead one back to them.Upon receiving my new PSU, I again inspected the interior of the unit. To my surprise – no grey goop. I couldn’t spot a drop with my eyes and a flashlight. In my previous unit, the one that died, grey goop was painfully obvious, and immediately spotted through the grate. This unit? Not a drop.

  2. Alex Mertz

    2080TI, x570Plus, h115i, ryzen9 32core. It handles it without issue. Good productIt make pc go vroom vroom

  3. Anthony D.

    Buy the SeaSonic SSR-850FXI’ve been using Corsair stuff since overclocking the snot out of their ram in 1998. 20 years.Nothing but a click and power for 1/100th of a second with this PSU. Don’t let them do to you what they did to me – read the low reviews. Exercise diligence, there are a lot of them. Thankfully my wonderful LGA1366 & supporting actors weren’t burned at the stake testing this boat anchor. Buy the SeaSonic.

  4. Michael C.

    cables are so stiffThis unit is fully modular was is great but the cables are really stiff for some reason. I spent a lot of time trying to manage the cables to make sure the stiffness wasn’t putting unnecessary stress on the motherboard headers. The 24 pin power cable is so rigid that when I tried to bend it, it felt like it could snap. This PSU is not ideal if you hope to achieve a very clean look with your cables. I’m using it in a Fractal Meshify C and it barely fits, if it was any larger it wouldn’t slide into place. The Meshify C is pretty compact so I would not recommend this PSU in that case, I’d recommend looking for something smaller. This is more of a case issue but just making a note about the compatibility.

  5. Spamazon DooD

    ALMOST FRIED MY WHOLE $3,000 PC. TERRIBLE PSUAfter hooking everything up and double checking my connections I flip the power switch and nothing lit up (usually my mobo will light up) so I tried hitting the power button on my pc case and after triple checking all my connections and trying to power it on again for the 5th time it turned on and immediately saw 4 or 5 sparks go up through my case where my fans are. So ALL of my fans got fried and my AIO pump and all stopped working.It must’ve been a faulty sata cable or just a bad PSU. I believe it to be DOA.I just recently built a brand new pc with new everything except the PSU. I used my old PSU which is a 750w evga supernova I’ve always liked.So me being bored and wanting to upgrade every single little thing. I go and buy another m.2 and this power supply just to be on the safe side and it costed me a fried HHD and almost lost my SSD. Had to RMA my AIO and MOBO. Thanks corsair for costing me a lot more money for nothing.

  6. Reese

    Excellent PSU, non-microwaveableContrary to what you may have heard, this PSU does not contain a boost function when put in the microwave. It does work quite well though, very quiet, does it’s job without talking back. I’ve managed to connect over 350 molex fans to my dryer, it has saved immensely on my power bill. The cables are kind of lame, they should’ve been individually sleeved with flame themed paracord and LEDs. Otherwise, good quality.

  7. Mimi

    Corsair means qualityI bought this PSU for my new build, needing a bit more ummph for the upgrades I did in CPU, RAM and GPU (if you don’t know what those acronyms stand for, you probably shouldn’t be reading this review). What I wanted was near silence and capable load handling when all the dependent resources were working at their max. This power supply is quiet and has not even hiccuped in the most demanding games I’ve played. Easy to install, even in an existing build. I would definitely buy this PSU again. One note to beginning builders: get a modular (or at least semi-modular) unit; then you are only using cabling you need and can add more as you add components to your system. Corsair is a brand I trust and buy without worry.

  8. Corvin

    Happy with this purchase.I’m happy with this purchase, it was overdue, and going for this PSU appears to have been the right choice.My only complaint is that the thicker cables are a bit too stiff.This might not be a problem in larger cases, or in cases with more thoughtful routing for cable management, but in mine I definitely noticed I had to struggle to get these into place on the motherboard when routing them from behind.

  9. Ron Pouliot

    it’s not as easy as you thinkI upgraded my video card and was told I would have to upgrade my power supply also. I’ve done both once before so I thought what the heck I can do this! it wasn’t that easy! the video card was not an issue but the power supply, Yikes! it came with a bag full of assorted wires you MAY need for different set ups. I was overwhelmed and at first thought this was way over my head! I didn’t know where to plug the wires into the power supply. anyways I took a breath a read the instructions many times over and was able to figure it out. was it worth it! Hell Yeah! my picture quality is excellent now!

  10. Krunalkumar Patel

    Corsair is great brand, but this was unfortunate! DOACorsair is great brand, i have RAM of same brand but this was unfortunate. It was DOA and i had really hard time figuring out if there was issue with my built. I was so scared if my mother board had issue or my processor is not good or i did not wired everything proper. but after some trial and error and with help of my old PC power supply i found out that this was cause and replaced with other brand unit!may be everyone have got proper unit but mine was exception!

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