GPU must be connected to PCIe slot so PCI will not work.
I think you could find more modern motherboards when putting so much money on a rig.
It would probably work anyway but you want it to last for a while.
Maybe moderboard with Ryzen CPU to mine some CPU only coins in addition to GPU mining?
I'm new in this world since this month
WHat i know is that cpu mining is not profitable anymore thats why i was putting up an GPU miner machine
Do you have any better specs to mine with the current diff on most coins?