PCIe Motherboard

x, , , ) PCIe cards can always operate in PCIe slots with the same or more lanes than the card

It will work just with reduced performance All pcie generations are reverse compatible The only question might be using a modern UEFI based

pcie 4 gpu in pcie 3 slot PCIe slot in smaller chunksbranches Example, a PCIe x8 card slot could be bifurcated into two x4 chunks or a PCIe x16 into four x4

pcie 40 in 30 slot Posted by StealthCivet: “GTX 760 in a PCIe slot”