Adaptec Serial ATA II RAID 2820SA. Host interface: PCI, Output interface: PCI-X 64-bit. Data transfer rate: 24000 Mbit/s. Processor clock speed: 133 MHz. Operating temperature range (T-T): 0 - 55 °C. Minimum system requirements: Intel / AMD 64-bit 3.3v PCI-X, Dimensions (WxDxH): 78.7 x 167.6 mm