Adaptec Serial ATA II Raid 2420SA. Host interface: PCI-X, Output interface: PCI-X 64-bit/133 MHz host interface (3.3v only). Data transfer rate: 3000 Mbit/s. Operating temperature range (T-T): 0 - 55 °C. Compatible operating systems: Windows 2000, SP4 (Professional, Advanced Server, Server, Enterprise) - 32bit only