Well, I don't have a good PSU for my system so I use two 630w Raidmax PSU's (One powerst the GPUs only, it has to be switched on before boot) and the other 630 poweres everything else.
SLi EVGA 560 ti
Asus p8z68 v
Hitatchi 500gb HD
Corsair H80 cooler
Three cougar fans (Cougar vortex fans maybe?)
I haven't had problems I was just wanting to know if this is okay for system health?
Another question I had was if the AX850 (corsair) is any better than the Corsair professional series 850w (The 80 Plus silver is almost as good as the gold and I really don't know if the difference justifies the higher cost)
For a system using two GeForce GTX 560 Ti graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 700 Watt or greater power supply that has a combined +12 Volt continuous current rating of 52 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors.
Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important.
I would choose the Corsair Professional Series HX750W (CMPSU-750HX) over the Corsair Professional Series Gold AX850 (CMPSU-850AX) because of better electrical performance.