What is the difference between PCIe Gen 3 and PCIe Gen 4?

What is the difference between PCIe Gen 3 and PCIe Gen 4? nvme pcie 4 0 in 3 0 slot PCIe can generally work in PCIe slots, though only at the lower performance level of the older version This means that instead of taking advantage of nvme vs m2 slot Add a inch NVMe SSD into a PCIe x4x8x16 slot in a desktop or server using the included screws, enabling ultra-fast data access

nvme m2 ssd slot You can insert a PCIe SSD card into a motherboard with PCIe slots, but this SSD won't be able to make full use of the higher bandwidth