The Serve RAID-5i Controller is an innovative PCI controller that works directly with the onboard LSI 1030 SCSI chipset to provide RAID-protected data storage to selected x Series servers. It supports both Ultra 320 & Ultra 160 SCSI HDD technologies. The PCI Serve RAID-5i supports the HDDs in the six bays of the engine as well as either the 25T 3-Disk Expansion, or one IBM 5194 NAS Storage Unit Model EXP. It may optionally be paired with one PCI Serve RAID 4 Mx Adapter. It provides 128 MB battery-backed cache & supports RAID levels 0, 1, 5, 00, 10, 50, 1E, & 1E0.