PciE slot saying empty

What is PCIe Bifurcation? - what does a pcie slot look like To most of us, PCI Express just means that big old slot where your graphics card sits, but this ingenious interconnect has hidden depths what are slot cars I would like to see how many PCI slots I have in a server and how many of them are in use Is this possible with just some Linux commands

what does an m2 slot look like slots may look like on a motherboard In this picture, there are three different types of expansion slots: PCI Express, PCI, and AGP