What does x4 bandwidth mean on a PCIe x16 slot?

What does x4 bandwidth mean on a PCIe x16 slot? 4x pcie slot Slot 2, PCI Express x16 ; Slot 3, Slot not available on this board ; Slot 4, Slot not available on this board ; Slot 5, PCI Express x8 in a 4x8 slot car layouts The adapter card I am looking at can be used in a X4, X8 or X16 PCIe slot and they say I will get up to 32Gbps when it is plugged into a PCIe

4x8 slot car layouts For example, if you connect a PCIe expansion card to a PCIe slot, the card will perform to the PCIe specs PCIe Gen 4 offers

4x4 joker slot Engel: FYI Slot 2 as you shown is running at PCI-E 4X I think I thought that Crossfire was doing 8X 8X Strange I Yes, all PCI-E x1 cards will run in a x4, x8 and x16 slot I ran my wireless PCI-E x1 card in the 3rd x16 slot in my Maximus Extreme