HP Smart Array P421/1GB FBWC 631673-B21 PCI-Express 3.0 x8 Low Profile SATA / SAS RAID Controller Card External Connectors: 2 x SFF-8088 mini-SAS Transfer Rate: Up to 6Gb/s RAID: RAID 0/1/5/10/50 Cache Memory: 1 GB DDR3 SDRAM Dimensions: 9.5 x 7.5 x 2.25