The SAS 5/i Integrated Controller from Dell is a 4-port SAS/SATA controller capable of 3.0 and 1.5 Gbps SAS/SATA link rates. The SAS 5/i controller employs an ARM966 processor to meet the data transfer flexibility requirements of the host interface PCI-X specification. It also employs the Fusion-MPT (Message Passing Technology) architecture, which features a performance based message passing protocol that off-loads the host CPU by completely managing all I/O and minimizes system bus overhead by coalescing interrupts. It incorporates a 1 MB flash memory that stores the firmware image, key configuration data and, limited error logging information. The SAS 5/i supports a 32-bi.e.ternal memory bus. The external memory controller block provides an interface for Flash ROM and NVSRAM devices. It is accompanied with an I/O cable.