max front side bus is 1333Mhz. Memory : Up to 32gb 667Mhz I/O Slots: three expansion slots ; 2 x 64-bit PCI-X ; 1 x PCI Express x8. Drive Controllers: Embedded PERC integrated PCI SAS controller. Raid Controllers : Embedded PERC 5/i, PERC4e/Di (single channel RAID with 256MB of battery-backup cache)