Hehe sorry ,
Will these be used as gaming pc with a decent CPU ?
Otherwise I'd be thinking about some getto rack configuration, with 4-5 card earch. (save on cost and power)
These are for my mining farm. I can do more cards per system, but then the cost for each PSU goes up or I need to do dual PSU's. Even though managing more rigs isn't fun, I'd rather keep my costs low and make management easier through software.
If you have the space, that might be a good idea. Fitting 4 cards instead of 2 per board would take less space and need 2 PSUs, but the board would cost more than double a dual slot board.
I looked around for a few minutes, but didn't see any outstanding deals on dual slot boards, except for refurbished ones from geeks.net.