The ATTO ExpressPCI UL4S offers the latest in SCSI storage connectivity, delivering the ultimate data-delivery performance of up to 320 MB/sec. The UL4S features a PCI-X bus interface and incorporates improved SCSI standards, making it ideal for delivering data to the most demanding Enterprise server and high-end workstation environments. Enabled with ATTO's exclusive Vpath Technology, the UL4S offers users the flexibility of connecting high-speed Ultra320 devices externally and slower legacy devices internally, or vice versa, without sacrificing the performance of the high-speed device. This allows users to take full advantage of Ultra320 and legacy speeds simultaneously.