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Corsair RMx Series, RM850x, 850W, Fully Modular Power Supply, 80+ Gold Certified
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- 80 PLUS Gold certified: High efficiency operation for less excess heat and lower operating costs
- 100% All Japanese 105 capacitors: Premium internal components ensure solid power delivery and long term reliability
- Zero RPM Fan Mode: Virtually silent operation at low and medium loads
- Fully Modular: Make your builds and upgrades easy, with clean, great-looking results
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From the manufacturer
Gold-Certified Efficiency and Tight Voltage Regulation for Superior Performance
Corsair RMx series power supplies give you extremely tight voltage control, quiet operation, Gold-certified efficiency, and a fully modular cable set. Built with all Japanese 105°C capacitors, they’re a great choice for high performance PCs where reliability is essential. 80 PLUS Gold efficiency reduces operating cost and excess heat, and Zero RPM fan mode ensures virtual silence at low and medium loads. And, the fully modular DC cables make builds and upgrades easy, with clean, great-looking results.
80 PLUS Gold Certified
Gold certification ensures high efficiency operation for less excess heat and lower operating costs.
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|Item Dimensions||3.38 x 7.08 x 5.9 in||5.91 x 6.5 x 3.35 in||8 x 18.6 x 6.8 in||8.5 x 11.4 x 5.1 in||6.3 x 5.9 x 3.4 in||5.91 x 6.5 x 3.3 in|
|Item Weight||4.37 lbs||6.75 lbs||8.6 lbs||6.7 lbs||6.4 lbs||8 lbs|
Corsair RMx series power supplies give you extremely tight voltage control, quiet operation, Gold-certified efficiency, and a fully modular cable set. Built with all Japanese 105 capacitors, they're a great choice for high performance PCs where reliability is essential. 80 PLUS Gold efficiency reduces operating cost and excess heat, and Zero RPM fan mode ensures virtual silence at low and medium loads. And, the fully modular DC cables make builds and upgrades easy, with clean, great-looking results. Customer Service / Tech support: 1-888-222-4346 opt. 1
Top customer reviews
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Now that that's out of the way, let me tell you about it's performance. Holy moly is this thing incredible. Currently I have it supporting an i7 8700 intel CPU, 1080 gtx graphics card, two sticks of DDR 8gb 3200 corsair ram, 2 2tb hard drives, 1 500bg m.2 drive, 3 case fans, and a corsair 105 hydro cooling system, and so far it has been more than smooth sailing. This thing powers my rig easy breezy, lemon squeezy, no problem whatsoever. And did I mention the sound it makes while running? No... I didn't... That's because it doesn't. This thing is so whisper quiet, that I have to check the case lights to know if my system is on. Even under the stress of playing PUBG or Overwatch at max settings, this thing refuses to make a peep. If I had one thing I had to absolutely complain about, it would be the price. $160 is pretty steep for a power supply and I'm sure similar products could perform comparably to this product. I'm well aware that some of that price tag is going into the corsair name brand, and of course the unique white look, but on top of that, it really is a top-notch quality product. I promise you won't regret pulling the trigger on this purchase!
I've been looking for a quiet, high quality PSU for some time now. Ive tried multiple EVGA models (600 G2, 750 G3, and an 850 G3) and they left much to be desired. Under normal operating conditions, EVGA's PSUs were the loudest component of my build. This PSU has turned the tide.
I've been playing FFXIV for a few hours with an overclocked 6700k and 1080ti and this PSU's fan doesn't even come on! I'm extremely happy with it's performance and noise level (really a lack thereof).
I tried the fan test button. The fan works, and even with it running it's extremely quiet.
My search for a silent PSU has ended with a PSU that's not even advertised as quiet.
I must say for a gold rated power supply this one is so close to a platinum it makes me smile. I guess to the letter it is shy of the platinum rating but that is much better than being just barely able to rate gold so that is a big plus for this PSU. The modular cables are flat and black from tip to tip. I replaced a failing TX750 (80 Plus) in my rig and can immediately appreciate not having to hide unused cables and not having to see rainbow colored wires at my connectors. For me this PSU is total overkill, I will post my rig specs at the bottom. I do have my eye on another 770 and will be getting 3 more 4TB reds but even so I might be up to about 700w peak usage (if stress testing my cpu and gpus together). My goal is to have headroom and stay + or - 20% of the most power efficient 50% mark. This will keep noise low and not add much stress to this component. As for now noise levels are nil, the zero rpm fan mode keeps it from even spinning as I have not ever reached 40% or higher long enough to heat up the unit. I have experience no coil whine at my current usage.
That all said, what is the difference between this and a HX1000i that warrants a price difference? Both are 1000w and both are within about 1% difference in efficiency. I learned that there is a measurable difference in electrical ripple. The RM1000 @ 100% reads about 45mV of voltage fluctuation to the HX1000i @ 100% reads under 25mV. RM @ 50% = 25mV to HX @ 50% = 13mV. For reference an AX1500i with it's DSP (digital power management) @ 100% has under 10mV of voltage ripple. These are millivolts or 0.001 volts so although there is a noticeable difference it is relatively small. Larger voltage ripple can cause electrical components to reach failure sooner or run at less than optimal, but I feel even the highest 45mV (0.045 V) of this RM1000 is not going to damage a computer or destabilize an everyday overclock as we don't use/need anything that sensitive.
For the mainstream overclocker like me, I would call this the sweet spot for price to performance. For the hardcore OCer running exotic cooling or extreme tweakers you can be assured if you have a HXi or AXi series you paid more for something more than marketing and blue or red stickers, respectively. Any world record chasers and LN2 users reading this are looking at the wrong PSU. I fully recommend this RM series to anyone running stock coolers up to AIO liquid cooling users. Above that this is a strong contender but there are better.
I named only corsair products thus far to keep things fair in comparisons but I am not a fanboy and you can get PSU's from Coolermaster, SeaSonic, Silverstone, and others with lower voltage ripple than this RM1000.
80 Plus test type 115V internal non-redundant 230V internal redundant
Percentage of rated load 10% 20% 50% 100% 10% 20% 50% 100%
80 Plus ----------------------- 80% 80% 80%
80 Plus Bronze --------------- 82% 85% 82% ------- 81% 85% 81%
80 Plus Silver --------------- 85% 88% 85% -------85% 89% 85%
80 Plus Gold ----------------- 87% 90% 87% ------- 88% 92% 88%
80 Plus Platinum ------------- 90% 92% 89% ------- 90% 94% 91%
80 Plus Titanium -------- 90% 92% 94% 90%---90% 94% 96% 91%
My Rig: Asus Z77 MVF mobo; i5 2500k (OC 4.6); CoolerMaster Hyper 212; HyperX Fury 16GB(2x8) 1866; Asus DC2 770 2GB (OC'd); RM1000 psu; CoolerMaster HAF X tower; Win 8.1 on WD Blue 1TB; storage on WD Red 4TB (yes i know my storage options are boring)