1U slim rack-mount packaging Up to two Quad-Core AMD Opteron 2000 Series Processors (up to 2.5 GHz) Up to 48 GB maximum DDR II memory 667 MHz using 12 DIMM slots Choice of two high-performance SAS or price/performance SATA hard disk drives Optional RAID-0, -1 for internal drives using the IBM HBA Controller PCI-Express (1) x16 standard; optional (1) x8 or (1) HTx