DELL PERC 4/DC (MegaRAID SCSI 320-2) Dual Ultra 320 SCSI RAID controller is a high-performance, intelligent peripheral component interconnect PCI-to-small computer system interface (SCSI) host adapter with RAID control capabilities. It provides reliability, high performance, fault-tolerant disk subsystem management, and is an ideal RAID solution for internal storage in Dell's workgroup, departmental, and enterprise systems. The RAID controller offers a cost-effective way to implement RAID in a server.