Mostly, I have been using the infamous BTC H81 ($51 dollar board) because of the low power consumption. And I have been running repeaters for my network around the house and have a switch I plug directly into the boards. But normally, I still can only get 4 GPUs to run (on windows) on these boards. I believe it's a power related problem, I'm doing something wrong. But they usually don't crash. It's just that they are such a pain the ass to set up. I also have an ASUS x79 Sabertooth, but it is crashing a lot with this version of SGminer, I don't know why. It could also be suffering from some heat problems, I'm not sure yet. I was going to turn on some more machines (all H81s), but I'm afraid I may blow some circuits, maybe I'll put one in the garage this weekend...Am thinking my mobo is not upto the job, what models do you find don't crash often ?