Dual 8-pins plus PCIe slot can provide 375w..... so yeah. Didn't EVGA have a triple pins video card as well?
However, that is all assuming they are going to be using 2 full, fat 580 GPUs.
Anybody else they this might be two 570s? If they are clocked at 875Mhz then even with only 480 cuda cores it will way out pace the current 590.