As far as I know computers like that only have one GPU (Graphics Card) as the maximum.

I just asked about using a Personal Computer for mining and was told that it is definitely not worthwhile under any circumstance.
https://bitcointalk.org/index.php?topic=2415854.0

You are better off purchasing something like a ASIC Bitcoin Miner machine.

"Since it’s now impossible to profitably mine Bitcoin with your computer, you’ll need specialized hardware called ASICs."


https://www.buybitcoinworldwide.com/mining/hardware/