Product Name SR1690WB 1U RM BB Xeon-DP 4x SATA 650W Refreshed, Product Type Barebone System, Controller Intel Serial ATA/300 Integrated RAID Controller supporting 0, 1, 1+0 RAID Level(s), Graphics Controller Server Engine With 64 MB DDR2 SDRAM Integrated, Maximum Memory DDR3-1333/PC3-10600 DDR3 SDRAM 6-channel DDR3-1066/PC3-8500 DDR3 SDRAM 6-channel, DDR3-800/PC3-6400 DDR3 SDRAM 6-channel, Network 2 x Intel 82576EB IEEE 802.3ab Gigabit Ethernet 10/100/1000Mbps Integrated Ports 2 x RJ-45 Network, 1 x RJ-45 Serial External, 4 x 4-pin Type A USB 2.0 USB Rear, 2 x 4-pin Type A USB 2.0 USB Front, Operating System Windows Server 2008 R2 Standard Supported, Windows Small Business Server 2003 R2 Supported, Windows Small Business Server 2008 Supported, Windows Small Business Server 2003 Supported, Red Hat Enterprise Linux 5 Supported, SuSE Linux Enterprise Server 10 Supported, SuSE Linux Enterprise Server 11 Supported, Case Style 1U Rack, Chipset Intel 5500 ,Expansion Bays 1 x 5.25\" Slimline Removable Media Bay Removable Media Bay Total 1 x External Removable Media Bay Total, 4 x Drive Bay Total Hot-swappable, Processor Interface Socket B, Processor Support Intel Xeon (Quad-core) Up to 3.20 GHz, Expansion Slots 1 x PCI Express x16 Total, 1 x PCI Express x8 Total, Power Supply 1 x 650 W / Power Factor Correcting, Fan System 4 x Non-redundant, Memory Slots: 240-pin DIMM (8 Total), Total Processor Support 2, Processor Speed 3.20 GHz ,Processor Type: Xeon, Additional Information QuickPath Technology: QuickPath Interconnect supports up to 6.4 GT/s, Expansion Slot Detail: PCI Express x8 slot has the bus speed of PCI Express x4, PCI Express x16 slot has the bus speed of PCI Express x8 , ships with North American Power Cord.