What does x4 bandwidth mean on a PCIe x16 slot?

Compatibility of PCIE bifurcation between Hyper pcie 2 slot The slot format used by both PCI Express and PCI Express is the x16 PCIe slot However, PCI Express slots are subjected to pciex1 slot your i5-3470 works on PCIe natively, Optiplex 7010 has only one slot bound to CPU PCIe, others are linked via chipset

pcie 20 x1 slot However, not all PCIe slots are the same, and this is where confusion may come in Slots have two main properties: physical size; electrical connectivity