What is PCIe x16 Slot

What is PCIe x16 Slot pcie slot length As per Wikipedia and other sites, the dimensions of the half-length PCIe card are mm × mm But as per the specification: enter pcie 4 card in pcie 3 slot Mini PCIe cards are divided into two different sizes, full-size cards, and half-size cards Mini PCI Express cards measure in at 30 x

pcie 4 card in pcie 3 slot It allows some flexibility to use cards of one size with slots of another PCIe cards fit in any PCIe slot on a motherboard that is at least as

pcie 4 slot PCI vs PCIe Slot · PCI-E x16 slot: It is 89mm long and has 164 pins It is often used for graphics cards and backward compatible with x1 x4  Two single-wide full-length x8 gen4 slots One single-wide half-length x4 gen3 slot preconfigured with the Apple IO card The Apple Thunderbolt