PCIe x8 NIC in PCIe x16 slot

PCIe Lanes

interface utilizes multiple technologies, including x2 to x4 PCIe Lanes, NVMe , SATA protocol, and USB

pcie 4 gpu in pcie 3 slot Supports PCIe motherboards and is backward compatible with PCIe and PCIe ; also supports PCIe x4 bus slot and is compatible with x8 x16 bus slot

pcie 4 in pcie 3 slot PCIe Lanes