What is a PCI Slot?

ASUS motherboard troubleshooting via Q-LED whats a pcie slot A card that bumps up to the physically larger x4 or x8 slot, like a USB expansion card, can transfer data four or eight times faster---and whats the best slot machine to play What does the x and the number mean? and why is this important for pcie slot i use, pcie

whats a slot machine 2 slot disables the bottom PCIe slot 2 is supposed to have gen PCI x4 capabilities, but what they say and what is reality often times are