PCIe x16 Gen3

I need to know whats the difference PCIe x16 and PCI Express pcie 2 slot slot can handle almost exactly what a PCIe x16 slot can currently handle PCIe x2 will still work with a PCIe x8 interface pcie 40 in 30 slot In its simplest form, PCIe is a point-to-point connection between two PCIe compatible devices, typically a motherboard and an expansion card or storage device

pcie 4 in pcie 3 slot Information on the compatibility of Intel® Arc™ A750 with PCIe slot