2U rack-optimized system Up to two Quad-Core AMD Opteron processors Model 2352 (2.1 GHz) or 2356 (2.3 GHz) Up to 64 GB DDR II memory 667 MHz via 16 DIMM slots Two PCI-Express x8 (low-profile) and 1 PCI-Express x4 (low-profile); 1 HTx (full-height/full-length) Riser, 1 PCI-X 133 MHz (full-height/full-length) or 1 PCI-Express x16 (full-height/full-length) Riser (optional) Integrated RAID-0, -1, -10 (RAID-5, -6, -10, -50, -60 and battery backup optional) Hot-swap redundant cooling, power and hard disk drives for high availability