x8 on an x16 PCIe
Can I plug a x16 GPU card (AMD) into a x8 PCIe slot that is itself one of 4 x8 PCIe slots on a x16 PCIe riser? ... if it's not open, you could a) use another ...
linux - Network Interface Card not using the correct PCI link ...
The different versions of PCI Express are both forward- and backward-compatible with each other, in the sense that you can run a PCIe 4.0 SSD in a PCIe 3.0 slot, for example.
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DDR5 graphics cards require a PCIe 5.0 slot, which is not available on most DDR4 motherboards that typically have PCIe 3.0 or 4.0 slots.