Corsair Professional Series  HX 750 Watt ATX/EPS Modular 80 PLUS Gold

I've been pretty happy with this PSU thus far. I've had it for over 5 months now with no issues except for initial installation which proved a bit tricky. My initial installation was unusual because I found this PSU to be larger than my previous one which also said it was ATX standard which meant I ended up having to modify my case to accommodate it. The quality and feel of the PSU during installation was good and I was especially pleased with the quality (although too short) primary PSU plug cord that came with it. It was very thick and exuded excellent quality for many years of service. Although I wish the rest of the PSU cables that came with it would have offered the same quality.I can tell this particular PSU was manufactured by Seasonic as its almost identical to the Seasonic 650 gold PSU I have in my AMD system, which is normally a great thing meaning fantastic quality, voltage regulation, noise control and many other benefits. Both are very good power supplies overall, this Corsair one simply offered a few more watts and better warranty over the Seasonic one. I've seen firsthand the incredible difference a quality PSU can make in any build and how many blue screens random lockups and other issues it can save you from. As such ever since my first build I've made certain to research and find some of the best PSU's on the market for my builds as my very first one is still running to this day 7 years later.The biggest gripe I have about both PSU's though and particularly the Corsair version, was the cheap flat ribbon style cables it came with for connections to the motherboard, and drives which I am not at all happy with. They (unlike the PSU itself) felt thin, cheap and too ridged to allow for sufficient flexibility to reach and wrap around tight confined spaces as those you'd obviously encounter in a case. I felt that competing companies offered superior cables with full ribbon sleeves and color coatings and appeared much thicker than these ones I received. Overall I felt this seriously detracted away from the total quality feel of the PSU.To be fair though this and the size issue have been my only major gripes with this PSU. Otherwise I've found it to be of excellent quality and have had zero problems with either one for several months of ownership and intensive use. I don't think you can go wrong with either one especially when you find them for under $100 like I did.Update Feb 2017Happy to report this PSU is still going strong after these years and powering my rig. I've gone through 3 graphics cards in that time with varying demands on the PSU this latest one being the most aggressive (R9 380) and so far the PSU has had no issues with any of them. One of these times when I'm really feeling it and need to I'll upgrade to dual graphics cards.

This PSU by Corsair is quite good. The modular design and cables provided make it very easy to switch out your old PSU and put this one with all your high end component requirements. It also helps to curb the overwhelming amount of cables in your case. It stays very quiet and it rarely gets warm. Especially for the price I got it, ( when I bought Dec. 19th, it was selling for 109.99) is a great cost/value standpoint. The gold rating gives you increased efficiency on the 80 plus scale if you're concerned about energy consumption as well. Corsair makes quality products and I will have no qualms in recommending this to anyone with a very high end single GPU set up. If you're looking into 3 way / 4 way SLI or 2/3 way Crossfire, then I would seriously consider upping the wattage to 1100+. I run an i5 4670k with as rock mobo, hyper 212 evo cooler with 4 noctua case fans, r9 290x, 3 hard drives, a blu ray burner / writer and this PSU performs like a champ.

So I recently bought an R9 290X Lighting GPU and it said on the box that it only needs 500W minimum PSU to run. The thing is I have a 550W PSU and although most games still run perfectly fine, some games that crashes often are Company of Heroes 2 and Battlefield 4. I suppose certain games requires more power to run than others but there is no way of knowing unless you play the game and have it crashed. So it's a trial by error process to figure out which will work with minimum power. I would be playing those games and without warning the computer would just shuts itself off. I did some research and found out it was my 550W PSU not supplying enough power to run these games. Well, to make a long story short I did some research and found this Corsair Professional Series HX 850 Watt PSU to be the top of line in terms of affordability and performance so you get the best of both world. I installed the beast, did a test run of those games for about an hour each (before these games would crash within 5-10 minutes of playing) and no more crashing or computer shutting itself off unexpectedly. It was actually easier to install than my previous 550W PSU because you can reuse the same connector cable for multiple devices so there is no need to connect, say 2 separate cables if you needed to power 2 hard drives because you can use the same cable with its 4 prong connectors to power 2 hard drive without cluttering up the case with cables. Games doesn't crash anymore and the PSU unit itself runs very quietly. Honestly I can't hear the fan noise at all. So, in summary if you've ever had your computer unexpectedly shuts down while you're gaming it's most likely you don't have enough power in your PSU and I'd highly recommend getting this one! Who'd ever thought certain games require more power to run than others? If you buy this PSU you won't have to worry about it!**Edit**I forgot to mention that the 4 screws that comes with this unit does not fit my case because my case is surprisingly thick but the screws are short so I couldn't mount it in. The screws that was from the original 550W PSU for some reason did not fit well with this unit so I couldn't use those either. Good thing I had 4 screws long enough that fits perfectly with this unit that I found in my garage so make sure your case is not too thick otherwise you will have to buy 4 screws that will be able to fit with this unit.