Speccy shows empty PCI slots "in use"? in Speccy Posted November 15, 2018 Thanks for the reply. Physically I have no doubt there is room to use at least one of the x1 slots, but I have not put anything in them yet. I'm just puzzled by Speccy saying these slots are already "in use" when they are empty. (And I'm wondering whether "in use" means their resources are tied-up, even though the slots have nothing in them -- but that's just a guess.) I'm getting the idea it is not a common issue, as I'm not finding anything to explain it so far. Thanks again.