This is the thing. A lot of PSUs claim to do one thing and give out another. They might say 500W but act like a 350. They burnoutm or draw a lot of heat. etc etc etc. You dont want to go down the road and get ready to run your SLI rig and find out you comp is unstable. Or later on find out your computer is unstable and cant figure out why just to find its a crappy PSU Ive used several PSUs and found enermax to be a consistent quality with unsurpassed performance. IF you got the $$$$ get enermax. Or you might be disappointed. And Voltage rail almost always puts out the right voltage on the MARK. Once again good luck.