what is the difference between pci express x16 and 3.0?
PCIe x16 means that slot has 16 PCI Express lanes. PCI Express 3.0 indicates the version of PCI Express connection. Your PCIe x16 slot may be in PCI Express 3.0 standart, or maybe in 2.0. ... When somebody says x16 or x1 or x2 or x4 or x8, it means the number or pcie lanes or serial pair wires in each direction.