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Pros: This is an update to my earlier review, after having done more research on this model and its slightly more expensive sibling, the Corsair RM850i.
I discovered that the reason for the bulky 24-pin, EPS (CPU) and PCI-e cables is that they include capacitors near the connector ends for enhanced ripple suppression. With flat cables, including and/or hiding them would probably be more difficult than using traditional round braided cables. These capacitors are hidden under a length of heatshrink which encloses the end of the braided section, with a slight bulge revealing their location.
While their inclusion makes for less attractive cables, it apparently does wonders for ripple suppression, as when I looked at reviews and charts on various sites like Toms Hardware, the RMx series beat many other competitors by quite a margin.
I also found out that CableMod supplies custom cables for this model - these move the capacitors further back towards the PSU so they can be hidden behind the motherboard area.
Cons: My previous complaint regarding heat still stands, and some reviews of the RM850i mention that that model also gets quite warm. However, the RM850i is Corsair Link compatible, and its fan can be controlled by software, unlike the RM850X. It also has a fan test button, plus a better fan bearing (Fluid Dynamic Bearing vs Rifle Bearing).
Overall Review: I am raising my rating by one egg after having seen third party tests of this PSU's excellent efficiency and performance, and internal build quality with all-Japanese capacitors.
I am still not happy with the heat generation though, and as Tom's Hardware noted (for the RM750X, but the same applies here), a switch to allow normal fan operation would have been nice -- the fan is very quiet anyway -- instead of always being in semi-passive mode.
I discounted not having Corsair Link compatibility as a minor point in my previous review, but was then unaware that the fan speed could be controlled in addition to fan and power monitoring. In a well-ventilated case that can exhaust heat well, this may not be an issue -- aside from the (lack of) digital interface and fan bearing, it is identical to the RM850i -- so you could save a few dollars with this model as overall performance is the same.
My main build is in an NZXT H440, which is quiet, but only middling in terms of ventilation, and the RM850X would get really hot inside that case's PSU shroud. As I mentioned in my previous review, the unit I received would only briefly spin up the fan even at 54% output load. In my situation the RM850i would be preferable, due to its fan/power monitoring and fan control via Corsair Link (the current revision works really well compared to early releases).
Note: I received the Corsair RM850X from Newegg for the purposes of my review(s).
Pros: - Thermally controlled fan. The only piece of hardware in my build which made noise was my psu. Corsair’s solution took care of that. Under low to moderate load the unit is passively cooled so this psu is literally dead silent. My office has become awkwardly quiet when my pc is on now. During gaming sessions the fan will normally spin up (and it’s quieter than my previous psu) however you won’t hear it over your headset/speakers so it’s just a pure win-win cooling solution.
- 850 watts should accommodate almost every gamer/build out there save for the extreme multi-gpu builds.
- 80 plus gold certified so very little power is wasted running this power supply versus one that is not. Which means while another 850 watt power supply (non 80+) may be a little cheaper up front, it may end up costing you just as much or more over its lifetime due to the additional energy costs.
- I love fully modular designs. It keeps cable management simple by using only the ones you need and Corsair provides more than enough options to meet almost every build.
- Surprisingly small by comparison to my last psu which also happens to be an 80+ gold cert 850 watt unit. It’s about 2 inches smaller in size which is impressive given its efficiency and passive cooling.
- 7 year warranty. That should tell you something about their confidence in the reliability of this power supply.
Cons: - There is literally only one thing I consider a con and it is that during passive cooling this psu can get hot. However anyone seriously considering an 850 watt psu probably already has a case that has decent cooling and airflow in it. Would this be a problem in most of the smaller to mid-sized towers, I have no doubt. But any of the larger mids to full towers will move enough air where this won’t be an issue so there’s absolutely no reason to deduct an egg for it.
Overall Review: This is the second 850 watt 80+ Gold modular psu I’ve gotten to review. I honestly didn’t think anyone could one up the previous one; I was wrong. I actually really like this one better for its cooling design and slightly smaller footprint.
Since my gaming rig is a few years old now, this psu definitely is a bit overkill. GTX680, i7 3770k, 32GB memory, 2 SSD’s, 2 platter drives, 7 case fans. (I don't normally list system specs, but it’s actually relevant for a psu review.) The maximum draw I’ve had on that build with the cpu and gpu burning away was around 430 watts. So there’s more than enough room to expand. Ie, I could run SLI or throw a 2nd modern high end gpu in there (GTX980TI for example) and still have 150+ watts of headroom. Use that as a reference for your build.
Despite the overkill I am a firm believer that having a little more power and connections than you need is better than coming up short when it comes to a psu. And in this case, I can’t ever see a need to replace this unit until the day it dies given how energy efficient modern hardware is getting.
I’ll end this review with one piece of advice. While you can buy cheaper parts for other components without losing much, do NOT get cheap with your wallet when it comes to the power supply. All things considered equal a good 850 watt psu will always be a smarter choice than a cheap 1000 watt.
With out a shadow of a doubt, a well earned 5 out of 5 eggs.
Pros: I've been testing this power supply for awhile now and am very impressed. I've always used Corsair power supplies over the years and have yet to have one fail. The test system is a 6-core i7 Extreme with 32GB DDR4 memory, R9 390x GPU, a DVD-RW drive and a Samsung PCIe SSD. According to some of the power supply calculators, I could add 2 more video cards before needing an upgrade.
The power supply is completely modular which is always a big selling point. All of the cables were of sufficient length to get them tied up and out of the way. The connections were solid and latch when inserted. I had plenty of cables left for future use, should I ever need them. It comes with everything you need for the install and they even include what Corsair calls a carrying case. I'm not sure why anyone needs a carrying case for their power supply, but I used it for the left over cables.
I'm impressed by how quiet it is even with the fan running. I did some GPU testing after installation to get things nice and warm. I couldn't hear the fan running at all.
All the voltages are well within spec according to the motherboard. Everything was within 0.03v of expected.
Cons: I really can't find anything to complain about. Reasonable price and it performs exactly as advertised.
Overall Review: Another great product from Corsair. It has everything you need and even comes with a 7 year warranty. I would definitely recommend this power supply.
Pros: The Corsair has built a great quality power supply that comes at a reasonable price. Features dual 8-pin CPU connectors and 6x PCI 6+2 connections for high-powered workstations and servers. This power supply is ready to handle two separate CPU's and BIG raid arrays. It's a gamers dream with 6 PCI-E cables being able to run several separate video cards to multiple monitors with ease. Fully Modular Cabling is a responsible length, not too long or too short, and the mesh wrapping is sturdy. Fully Modular is really the way to go if you're going to be modifying/tinkering in your computer frequently.
Cons: This is a BIG power supply (in physical size). I'd probably only recommend it if you are running multiple video cards or dual cpus. The penalty for going 'BIG Power' is that you'll need a big case. Neither are really a con should just do some homework on if you need a power supply this big.
Overall Review: I used this to covert a 1u rack mounted dell server (dual xeon, 72gb memory) into a tower case saving one more computer from the landfill and easing future hardware maintenance costs by swapping into a standard ATX power supply and case system. I ran two separate raid arrays and an external video card. Couldn't be happier!
Pros: Nicely wrapped cables<br>cables are plenty long enough for my Haf 932 full tower routed behind motherboard.<br>fully modular so you just use what you need.<br>Over 70 amps on a single 12 volt rail which make a big difference<br>Fan only runs when under a large load i have only gotten it to run once during my testing.<br>Can handle up to 3 video cards with no problem.<br>HEAVY which usually me good build quality.<br>Good looking if that matters to you.<br>Has every protection than any other PSU has plus more.<br>Even has a bag to put the spare cables you are not using in.<br>They thought of everything.
Cons: none that I could find
Overall Review: I put this is my main rig which has a gigabyte Z170 motherboard and a quad core i5. 3 DVD drives and two R9 280x sapphire video cards in crossfire. I also use a aftermarket CPU cooler and my CPU is overclocked to 4.4 mghtz.I have 2 x 200mm fans and 3 120mm fans. I use low RPM fans because I don't like to sit here and listen to a wind tunnel. The CPU connector was long enough to route behind motherboard then bring it out a hole in the top to the 4+4 connector, even had a bit to spare and my tower is a full ATX tower.<br>I have had problems in the past with a bottom mounted PSU not having long enough cables to reach the CPU connector. So it is nice not to have to worry about it.<br>It being fully modular with nicely wrapped cables that are not to stiff I put all cables behind my motherboard and didn't have a problems when I put the side back on. My last PSU I had to lay computer on side and use my knee to hold side down while I slid it on and it still took 4 or 5 tries before I got it on right. This PSU doesn't have that problem. <br>On a PSU calculator my rig calls for 650 watt PSU and before I got this to review I had a 1000 watt Silverstone in it because I like head room and I never know when i am going to add parts to my computer. Even though all my hard drive bays are full with either SSD or regular platter drives for back-up. I am going to retire my Silverstone now and use this Corsair. Not as much headroom you would think but my 1000 watt Silverstone only has 80 amps on the 12 volt rail. This Corsair has a tad over 70 and I like not hearing the back fan. All in all you cant go wrong with this PSU. Build quality is great cable lengths are plenty long enough and the cable wrapping is nice. It puts out all the power I need and I would say 90% of the people out there need. Also has a 7 year warranty I am used to 1 to 3 year warranty I had 5 on my Silverstone and I thought that was great. For Corsair to put a 7 year warranty on it they must know they have a great product.4 moths later and it is still running like a champ and I have upgraded my computer with better video card and more ram. I would still recommend this to anyone looking for a high quality hassle free PSU. The single 12 volt rail with 70 amps is a big help.
Pros: 1. Fully modular
2. Outstanding performance
3. Quiet even under moderate load
4. Smaller for the power output
5. Good supply of cables
6. Well made
I have used several PSU in this line. This is another in a long list of great power supplies. It is well worth the price. The fully modular cables are very useful for keeping your case tidy and powering everything. There are a lot of connectors. Corsair is starting to move away from some of the legacy equipment. If you have legacy equipment, why are you buying an 850 watt power supply?
It is nice that it runs in quiet mode unless you are taxing it. Then it is not horrible noisy. It was stable and worked every time, while maintaining a fairly compact size. You will not find an 850 watt power supply that is the same size as a 450 watt, but this is just not that much bigger.
Even in a bad environment – no much air flow and confined, it was stable.
Cons: 1. Gets hot when passively cooling
2. Will not fit in all cases
This unit does run hot. Not horribly hot, but keep that in mind when building your system. It needs to have some breathing room and/or good ventilation. This is more for longevity.
If you have a small case – look elsewhere, but then again a small case would probably mean you don’t need this much horsepower.
Overall Review: I have used several PSUs in this line of power supplies over the years. This one just like the others is a good work horse. Getting the 80 plus gold certification is important, because it tells you that Corsair did not scrimp on the inside of it. The cables are flexible enough for some pretty good routing, but stout enough not to worry you about their life. Overall it is a good package.
It ran a Devil’s Canyon and two 290x in Crossfire no problems. Stress test – no problem. It just worked. I cannot complain about it. During gaming it did cycle up the fans, but the noise was not horrible.
If you are serious gamer – this is a good choice for a power supply. If you want to do some exotic, then get a bigger one. This is a good choice for a decent gaming rig. It will suck so much power from the wall that you can watch you lights dim under load, but it will supply plenty of juice for the game/work that you need to do.
Pros: One of the best power supplies money can buy! High-efficiency, high power output, and Aesthetically beautiful. Fully modular with flat cables, and a build quality that is second to none. This thing is almost completely silent even under load.
Cons: It didn't include free cookies?
Overall Review: A power supply unit is rarely something to get excited about, but you should be excited when buying this one! The RM850x has everything you'd want in a power supply, and much more.
- Gold certified efficiency. This simply means you power supply is wasting minimal energy, and over time, this can save you money!
- Flat modular cables means that the mess of wiring just got much cleaner. You choose which cables you need to use, and store the others, rather than having them cluttering up your case. The flat design allows for a clean cabling layout, and better airflow in your case.
- Whisper quiet even under load.
I'm running this beast in my main rig with the following components
MSI Z170 Gaming motherboard
2x AMD 290x GPU
4 240gb SSD drives
2 mechanical hard drives
Blu Ray Writer
and various USB devices
With the above system under heavy load (even GPUs), I checked each voltage manually (not with the BIOS or software), and all voltages were solid with little to no fluctuation. This is always a good sign, as many of these tests in the past (with lesser PSU) have shown voltages can become unstable under heavy load. In layman's terms, the performance is excellent, and holds stable when you really need it. All the while it was cool to the touch, and the fan whisper quiet. You really can't ask for more!
I am very happy with this PSU, obviously!
Pros: It has a quiet fan.
It has 5 jacks that allow for pcie and cpu cables.
it will push 800 watts 24/7
Cons: It has 3 pcie cables with 2 jacks each.
why is this a con?
It is lacking a mother board power clip attachment>
Overall Review: If you want to do bitcoin mining many mining machines draw too much power on 3 pcie cables they need four pcie cables. A two headed pcie cable like the ones here can only use 1 plug. So 1 more pcie cable with 2 plugs would allow you to plug in 4 separate cables to your miner.
Also Corsair did not provide a motherboard power-on attachment This plugs into the mother board cable or the motherboard jack on the psu and tells the psu to turn on.
So basically this piece of gear is not geared for those of us the mine
BTC or any other coins. To mention a competitor the Evga 850 g2 comes with 2 single pcie cables and 2 double pcie cables which makes it a better mining psu.
So I gave this psu 4 stars not 5 stars.
It is a great psu if you use it in a pc. A five star model better then the evga 850 watt g2 because it has a very quiet fan.
I wish newegg would allow 4.5 stars as I truly like it running my
pc. I have an intel i5 6600k with a gigabyte mobo and it works really well for that type of use.
So I would tell people buy this for a 2 gpu pc over the evga.
But the evga for mining.