What does the X4 mean in an PCIe Gen X4 NVME drive?

How much space is between each PCIe slot? (I need to know pcie 3 slot PCIe x32 However, the connection will run at the speed of the slowest device, so a PCIe SSD can only run at PCIe even in a slot that supports PCIe pciex16 slot The letter “x” stands for the physical dimensions of the slot and how many lanes are in the expansion slot PCIe Gen 3 VS PCIe Gen 4

pcie nvme slot Yes, you can use a PCIe graphics card in a PCIe slot PCIe slots are backward compatible with PCIe cards, meaning they can still work together