pci 4.0 card in 3.0 slot: Can a PCIE 3.0 Riser Be Used in a PCIE 4.0 Slot. Can a PCIe 4.0 Device Work in a PCIe 3.0 Slot? (Answered). Pcie 3.0 Graphics Card List.
For example, a PCI Express 4.0 graphics card works even if you connect it to a motherboard that only supports PCI Express 3.0 or even 2.0.
There is available PCI-e 4.0 or 3.0 x16
Slot on Mobo 2. The motherboard can support PCIe x16 Bifurcation itself, and can be set as"PCI-e x4x4x4x4" in BIOS 3.
Can you put a PCIe 4.0 card in a 2.0 slot? ... However, if you connect a PCIe 3.0 card to a
PCIe 4.0 slot, the card will perform to the PCIe 3.0 specs.