What does x4 bandwidth mean on a PCIe x16 slot?

pcie 2 slot
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PCIe x16 Gen expansion backplane with two slots The PCIe x16 Gen3 backplane has two PCI Express x16 slots, with one slot supporting the OSS target

GEONIX GEFORCE GT 730LP 4GB DDR3 Graphic Card 64bit Dual Slot Multiple Outputs- VGA, HDMI, DVI Support PCI-e2 Profile ZORBES® Graphics Card Bracket,

pciex16 slot configuration slot can handle almost exactly what a PCIe x16 slot can currently handle PCIe x2 will still work with a PCIe x8 interface

pcie 4 card in pcie 3 slot slot PCIe is large The But PCIe is a serial data transfer protocol Legacy PCI and PCIe slots topologies Fig 2 Legacy PCI and PCIe slots topologies