Originally Posted by sun_akaffck
well this psu has many good reviews the only negative thing is that its cooler master and not modular but this is quite a good psu and your specs are quite hi end in comparison to hx650 can u sli 580????
The 750W Cooler Master RealPower Pro has a +12V wattage capacity of 648W (the same as the SeaSonic X-650, which is a 650W continuous-rated unit)
Now, Guru3D was able to get their test system
to pull 719W from the wall outlet when just the GTX 580s
were under load (source
). That means that their system pulled about 612W from the power supply, but it doesn't account for the rest of the system: Guru3D recommends adding about 100-150W to account for the rest of the system which brings us way beyond the +12V capacity of the 750W RealPower Pro.
So I would not attempt it. You can if you want to, but I certainly wouldn't.
However, if you had a higher quality 750W with a +12V capacity of 744W, then you'd be fine.