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However, PCIe x1 cards can be installed into all PCIe expansion
slots, including x4, x8, and x16
PCIe slots. Often people underestimate their role in
PCIe x1 slots.
If you buy a PCIe 4.0 expansion card but only have PCIe 3.0
slots on your motherboard. You can still use PCIe 4.0 expansion cards with PCIe 3.0 motherboards, thanks to PCIe 4.0’s backward compatibility.
PCI Express to PCI Express expansion with 3 PCIe x8 Gen-
3 slots. ... PCI Express to PCI Express Expansion with PCIe 3 x8 Gen-3 slots.