Identify a variety of PCI slots

Non-hot-plug PCI riser board slot definitions pci 1 slot For example, my NIC is a ConnectX3 single port which is a x4 card That's not going to fit in a 1x slot pcie 40 in pcie 30 slot What is it and how can I use it? (With 1-slot GPUs, other connectors are visible, including one which is probably the old PCI connection

pcie slot bracket PCI is a bus topology while PCIe is point-to-point · PCIe has the concept of lanes, where 1–16 serial lanes can