Bus Type: PCI Express x 8 (8 Lane) Connects up to 4 external SATA II devices Also compatible with 1.5 Gbps SATA 1.0a drives Speed: Up to 3 Gbps for each channel Port Multiplier & NCQ (Native Command Queuing) support Supports RAID levels 0, 1, 0+1, 5 & JBODSupplied with standard & low-profile backplates Connector: SATA 4x Multilane Infiniband (screw type) Software compatibility: 32/64 bit support for Windows 2000/XP/ Vista/ Windows 7/ Server 2003, 2008, Linux, Supports ' Non booting' drivers up to Mac OS v.10.62 Year warranty