Does Final Cut really make use of a 3rd GPU? No genuine macs ship with 3 GPUs, do they?
Do you think it matters if all 3 slows have similar numbers of PCIe lanes? For example, on a Gigabyte GA-Z97X-UD7 TH board, there's 3 "x16" slots, with 16, 8 and 4 lanes. Would adding a 3rd 280X card in...