1---Dual Intel 64-bit Xeon Dual-Core, 667 / 1066 / 1333 MHz FSB. 2---Up to 64GB 667/533MHz DDR2 ECC FB-DIMM (Fully Buffered DIMM). 3---2 (x8) 1 (x4) PCI-Express, 2x 64-bit 133MHz PCI-X, 1x 64-bit 100MHz PCI-X. 4---Intel (ESB2/Gilgal) 82563EB Dual-port Gigabit Ethernet Controllerr. 5---Dual-Channel U320 SCSI with 8 (4+4) Hot-swap Drive. 6---Zero Channel RAID Support. 7---800W High Efficiency Redundant Power Supply. 8---Tower or Rackmount