Explaining PCIe Slots

What are PCIe Slots in PC? pcie 2 slot slot PCIe is large The But PCIe is a serial data transfer protocol Legacy PCI and PCIe slots topologies Fig 2 Legacy PCI and PCIe slots topologies pcie slot bracket The slot format used by both PCI Express and PCI Express is the x16 PCIe slot However, PCI Express slots are subjected to

pcie slot size PCIe cards that were working on older slots I want to know if I can use my old NI PCIe cards on the new computer because I'm not