The PCI-X DDR dual-channel Ultra320 SCSI adapter is a high-performance SCSI adapter for PCI-X and PCI systems. The adapter provides two SCSI channels (buses), each capable of running 320 MBps (maximum). Each SCSI bus can either be internal (on systems that support internal SCSI devices or backplane attachments) or external, but not both. Internally attached Ultra320 devices run at a data rate of up to 320 MBps on systems that have internal backplanes that are capable of supporting Ultra320 speeds. The adapter uses and supports low voltage differential (LVD) drivers and receivers only.