PCIe vs NVMe: What's the difference?

KONYEAD x16 to m-Key nvme x 4 ssd Expansion nvme pcie 4 0 in 3 0 slot i plan on getting a second but my motherboard has 1 slot and 1 slot I currently have a Kingston nv2 1tb so i was wondering nvme slot vs m2 NVMe SSDs in practical tests: What is the real advantage of PCIe compared to and is it worth the extra cost? But since slot

nvme slot types For now, the biggest change consumers will see is even faster NVMe SSDs on offer This comes as a result of PCIe providing double the data