LSI MegaRAID SAS 8708EM2. Supported hard disk drive interfaces: Serial ATA, Host interface: PCI Express x8, PCI Card form factor: half-height (low-profile). Internal memory: 256 MB, Internal memory type: DDR2, Memory clock speed: 667 MHz. Data transfer rate: 3 Gbit/s. Processor family: PowerPC, Processor clock speed: 500 MHz. Mean time between failures (MTBF): 680002 h