Okay my motherboard is m5a99fx pro r2.0 and it has 4 PCI x16 I'm going to be having 3 amd 7970s oc edition but does putting into the motherboard have to be left to right it's because when I put my 2nd card it's going to cover the 3rd PCIx16 so then would It be fine if I put my 3rd gpu card into the 4th PCIx16 would it still be a 3 way crossfire?