PCIE GPU on PCIE MOBO

Can You Use a PCIe Express Card In a Slot? pcie 2 0 x16 slot Yes, the PCIe cards can indeed be installed in PCIe slots and vis-a-vis as the PCI interface is designed as forward and backwards-compatible However, pcie gen 4 in gen 3 slot 2 x16 electrical slots But what about the remaining 8 lanes? If we are lucky they will go to a x16 physical slot So we'll be able to fit 3 graphics cards

pcie 2 slot , PCI Express x1 and PCI Express x16 It is clear that the PCI Express x16 adapter will not physically fit in the PCI x1 slot PCI and PCI Express