Question - PCIe or PCIe

Can You Use a PCIe Express Card In a Slot? can i put a pcie 4 0 in a 3 0 slot can use my Amazon affiliate link below 3iErIRH Watch my Ryzen 7 5800X candy bars slot The current PCIe Gen 3 slots have started to be replaced with PCIe Gen 4 can install more powerful hardware on a smaller PCIe slot

can i use pcie 40 in 50 slot PCIe has retained the same physical design, so you can plug a PCIe device into a PCIe slot or vice versa These cards only use four