How To Check PCIe Slot Version, Generation & Bandwidth
PCIe slots feature the same pin layout and thus are forwards and backward-compatible. However, a PCIe 4.0 card slotted into a PCIe 3.0 slot will run at the lowest denomination speed (PCIe 3.0).
What GPU can my motherboard support?: how to check ...
How do you check what GPU your motherboard supports? Thankfully it's relatively simple, as all PCIe versions are compatible with each other.
motherboard - Is PCI Express x4 faster or slower than a standard ...
The common PCI Express slots we see on motherboards are PCIe x1, PCIe x4, PCIe x8, and PCIe x16.