What's the bandwidth and form factor for PCIe x1 x4 x8 and x16?

What's the bandwidth and form factor for PCIe x1 x4 x8 and x16? pcie slot dimensions 1 slot = 20mm, with the width of 110mm pcie slot meaning 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

pcie slot meaning One PCIe x8 Slot Supports one half-length+ , full-height, single-width PCIe card

pcie 30 x4 slot Slot size correlates with speed… well, mostly Almost all motherboards offer a mixture of long and short PCI-E slots A full-length 89mm slot PCIe Slots ; Slot 5 CPU 2 PCIe ; NOTE: A PCIe slot that supports an FHFL PCIe card is backward compatible with an FHHL or HHHL PCIe card A