The difference between PCIe x1, x4, x8, x16 and x32

PCI Express to 4 Slot PCI Expansion System pcie x1 slot function Providing total bandwidth up to 250MBps from the PCIe x1 host controller card allows the computer to function as though the expansion chassis cards were pciex16 slot PCIe compatibility and performance generates a LOT of confusion In Explaining PCIe Slots

pcie slot height The smallest of the PCI Express slots, your standard PCI Express x1 slot is essentially your starting point for most expansion cards, especially port expansions