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

4x4 NVMe SSD Silent PCIe Card - Sonnet slot m2 nvme In this video I discuss the difference between an SSD and a NVME PCI-Ex4 SSD From how slot mustang On regular office and gaming PC motherboards, the slot closest to the CPU will most often be the one that has the highest bandwidth, but always check your

slot 139 2 SSD? SATA vs M2 NVMe; B key, B+M key, and M key; Length A B key only works on a B slot, and the same hols for an M key and M slot