The 650-0021-316 is a part of an LSI MegaRAID 12Gbps family of SAS RAID controllers. This part offers increased performance and improved connectivity options. It provides twelve external 6 Gb/s SAS ports, two x4 internal mini-SAS HD connectors and one Integrated Memory Module. It also includes an innovate RAID-on-Chip processor with 4GB DDR3 1866MHz SDRAM cache memory, enabling faster data throughput and faster RAID level migration. This part supports RAID levels 0, 1, 10, 5, 50, 6 and 60 and SAS 2.0, 3.0 and the newest bbu (Battery Backed Up) capabiltiies. The controller also includes MegaRAID CacheCade support, allowing users to utilize SSDs as caching drives.