PCIe vs NVMe: Are They the Same?

Gen 4 is faster than Gen 3

With this AMPCOM NVMe SSD PCI-E X4 Adapter, you could add a NVME SSD on your motherboard without slot With the channel of PCI-E X4,

pcie slot meaning PCIe is backward compatible It's also forward compatible So, you can insert PCIe expansion cards into PCIe slots, but your data

pcie slot width Looking at Amazon there is PCIe Gen 3 NVME and PCIe Gen 4 NVME for sale I don't see this even mentioned on the Wikipedia page for NVM Express