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

does the 1x SSD Combo (NVMe PCIe Gen3 x4 SATA nvme pcie slot Two types of SSD · SSDs using the SATA bus tend to use B-keys · SSDs using the PCIe x2 bus can use both B-keys and M-keys (to maximize nvme slot types On some motherboards, the BIOS will allow a single physical PCIe x16 slot to be divided into two or more logical PCIe slots in order to install

nvme m2 slot motherboard You can have one, four, eight or sixteen lanes in a single PCIe slot, denoted as x1, x4, x8, or x16 PCIe technology enables interface speeds of