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

PCI-Express x4 Internal SSDs nvme gen 4 in gen 3 slot Gen3, Windows boot time, games launch time, File copy NVMe Gen 3 vs NVMe Gen 4 nvme m2 slot If it's B only, it won't fit Total supports 2 x slot and 4 x SATA 6Gbs ports 3rd Gen AMD Ryzen™ Processors : 1 x _1 socket 3

nvme vs m2 slot The card physically has an X4 interface, so it could be plugged into an X4, X8, or X16 slot It can still physically only access 4 lanes (else