i'm not qualified in any way to setup a rig, but i'm giving it a go with a asus supercomputer mobo, and 7 x 5770 single slot cards.. will see how it goes
You do know that there is no motherboard that can fit 7 PCI-E x16 cards, right?
Or that most decent 5770 are double slots?
Or no PSU powerful enough or probably no circuit breaker and outlet in your house powerful enough to feed that monster?
I've seen a bunch of picts where people have ribbon cables extending their even the x1 ports for more video cards. And I have heard of people using multiple power supplies. I heard there was a limit of 4 cards for Windows machines (but I don't know for sure). A lot of people seem to be running without a case so you can just have all the cards sitting on a shelf with a fan blowing on them.