I wonder what sort of PSU I'd need for an MSI Big Bang Marshal board with 4x N580GTX Lightning cards in it? (There's 8 PCIe slots, but even ignoring clearance issues with the stock cooling which could probably be dealt with, I think I read somewhere that the drivers only support 4 cards for some reason?)
Even with 4 cards instead of 8, I'm sure I can't afford this setup, but it's always fun to think about this sort of stuff anyways. (And if there was a way to convince it to run 8 cards... Major GPGPU monster there. Though I'd definitely need phase-change cooling then.) :-P