It is an external Mini Serial Attached SCSI HD x4 (SFF-8644) to Mini Serial Attached SCSI x4 (SFF-8088) cable
The High Density (HD) system referenced as HD Mini-SAS (SFF-8644) in the SAS 2.1 standard, meets the 6Gb/s SAS specification.
These new HD Connectors will be used on the SAS 3.0 specification when it is released. Cable material may change but the connectors will be the next generation of SAS to run at 12Gb/s.
External HD Mini-SAS Copper Cables Length: 50cm
Notice: There are SFF-8643 port for belowing raid card: LSI 9207-8i Adaptec Raid 71605. Adaptec Raid 72405. Adaptec Raid 8885Q. Adaptec Raid 8885. Adaptec Raid 8805. Adaptec Raid 8885E. Adaptec Raid 71685. Adaptec Raid 7805. Adaptec Raid 71605E. Adaptec Raid 78165. Adaptec Raid 81605ZQ. There are SFF-8644 port for belowing raid card: LSISAS9202-16e. Adaptec Raid 71685. Adaptec Raid 8885Q. Adaptec Raid 8885. Adaptec Raid 8885E. Adaptec Raid 78165.

Cable Mini-SASX4 SFF-8088 To SFF-8644 SAS