I hate to be the bearer of bad news but to maximize the performance of 4 cards you should be running a 2011 system. Although it does depend on what resolution you run under 1080p the performance drop is small like 5% but that is for two cards. I think for for 3+ the drop gets bigger, but you should check on that. But if you must stick with the 1155 look at asus or gigabyte I think the ud5 gig has some good pcie set ups. But really with 4 7950's its just silly to not use a 2011 set up.