I scrapped the idea of running 4 gpus and went with 3 instead, im using HD7950s, this board (ASRock Z170 Pro4/D3) suits my needs, it has a 1151 socket, ddr3, 5 PCI-E slots (two x16 and three x1, my question is, how much slower are gpus running in the x1 slots compared to the ones running in the...