‎Which pci slot is which?

PCI Express is a serial connection that operates more A x16 PCIe slot can accommodate far more data per second than current AGP 8x connections allow

The number after the x tells you how many lanes that PCIe slot has PCI-SIG, which defines

pcle x1 slot A PCIe card, also known as a PCI Express card, is an expansion card that connects to a computer's motherboard using a PCIe slot These cards are used to enhance

pcle slot Examples of expansion slots include the peripheral component interconnect slot PCI Express serial bus slot, and the PCI-extended slot 9