HP Smart Array P421/2GB FBWC 6Gb 2-ports Ext SAS Controller, SmartArray. Supported hard disk drive interfaces: SAS, Serial ATA, Host interface: PCI Express x8, PCI Card form factor: half-height (low-profile). Internal memory: 2048 MB, Internal memory type: DDR3, Memory clock speed: 1333 MHz. Data transfer rate: 6 Gbit/s. Width: 57.2 mm, Depth: 190.5 mm, Height: 241.3 mm