PCIe VS : What are the differences and similarities?

SSD pcie gen 3 m 2 pcie 4 0 in 3 0 slot 2 NVMe PCIe SSDs offer tremendous performance, but Sonnet's 4x4 PCIe Card enables you to mount up to four of them into a single x16 card slot and combine m2 slot 2 ports take up less physical space than ports, motherboard manufacturers typically add ports rather than ports As compared to M2,

m2 slot types Unlike a more obvious and drastic upgrade where you can see the difference in the connector itself, PCIe 3 and 4 drives look identical from