What is PCIe Gen5/Gen4/Gen3？

PCIe (Peripheral Component Interconnect Express) Gen5/Gen4/Gen3 are successive generations of high-speed serial computer expansion bus standards, each doubling the bandwidth of its predecessor for faster data transfer between components.

Simply Put:

Think of PCIe generations like highway speed limits. Gen3 is 40 km/h, steady but slow. Gen4 doubles that to 80 km/h, moving data faster with the same spacing. Gen5 pushes it to 160 km/h, greatly increasing speed. Each upgrade raises the limit, allowing data to move faster and more efficiently between components.