Adaptec RAID 6405T. Supported hard disk drive interfaces: SAS, Serial ATA, Host interface: PCI Express x8, PCI Card form factor: half-height (low-profile). Internal memory: 512 MB, Internal memory type: DDR2, Memory clock speed: 667 MHz. Data transfer rate: 6 Gbit/s. Mean time between failures (MTBF): 889115 h. Voltage: 12 V