This item is Internal HD Mini SAS SFF-8643 to Mini SAS 36pin SFF-8087 connection cable. SFF-8643 is the new connector uses less PCB real estate and allows higher port density for internal hosts and devices. High Density (HD) Mini SAS SFF-8643 Internal cable assemblies are available for SAS 2.1, 6Gb/s and SAS 3.0, 12Gb/s specification.