Key Features 1. Dual Intel® 64-bit Xeon® Quad-Core or Dual-Core, with 1333 / 1066 MHz FSB 2. Up to 32GB 667/533MHZ DDR2 ECC Register SDRAM 3. 1 (x8) PCI-E Slot 4. Intel® 82573V & 82573L Gigabit Ethernet Controller 5. 4 x 3.5" Hot-swap SATA Drive Trays 6. 520W High-efficiency Power Supply