PCIe 3.0 4x drive bays

PCIe 3.0 4x

— the option found exclusively in models for M.2 drives. These modules use an M.2 connector, which is most often implemented in the PCIe format. In the specifications, the PCIe version and the number of lanes are usually specified, as this directly affects the supported speeds. For instance, the "PCIe3.0 4x" marking provides a speed of about 3.9 GB/s. At the same time, drives and enclosures with different versions and numbers of PCIe lanes are usually compatible with each other in this case, except that the speed will be limited by the capabilities of the slower interface.