What are PCIe Slots in PC?

What are PCIe Slots in PC? pcie slot x16 Primary riser cage connector, connected to processor 1 or the southbridge PCIe 3-slot riser cage* PCIe 2-slot x16 riser cage 1 pcie x16 expansion slot A x8 card will work in an x1 slot, but will be limited to x1 speeds A x8 card will also work fine in a x4 slot It will be limited to x4 speeds

pcie x16 expansion slot I thought PCIe was superceding PCIX But I have 2 PCIe x 1 slots on my motherboard, 3 ordinary PCI slots and one which is

pcie 20 x1 slot Identifying Different Types of PCIe Slots A x16 PCIe slot can accommodate far more data per second than current AGP 8x connections allow In addition, a x16 PCIe slot can supply 75 watts of power to