What does the X4 mean in an PCIe Gen X4 NVME drive?

Solved: good afternoon, i'd like to know if the motherboard hp oasis 886b Z590H supports at least one ssd pcie ; on the technical

Client PCIe NVMe SSDs typically only use the 2280 form factor because its slim design allows it to easily fit into desktop and notebook PCs Enterprise-

m24 slot wallet 2 adapters provide one slot for PCIe, and one for SATA True dual PCIe cards have x8 connector, for example AOC-SLG3-2M2 To fully

m2 slot screw M2 Full 2 2 2 DIMMs Maximum Memory 48384 GB B440-M2 Full 4 PCIe adapters or internal storage resources Also based on Intel Xeon