Top of the line performance & features The ThinkStation D10 is designed for professionals who demand the utmost in performance.Featuring our legendary Think design and the latest technologies from Intel® and NVIDIA, it delivers the performance you crave and the reliability you need. Processor: Intel Xeon QuadCore Proc E5430 2.66GHz, 12MB L2 Cache, 1333MHzFSB Memory : 4GB (4x1GB) DDR2 SDRAM 667MHz, Max up to 32 GB RAM Slots Total(Available) HDD: 500 GB (2 x 250GB) SATA HDD Optical Drive : DVD Recordable Graphics : 512 MB nVidia Quadro FX-1700 Graphics Adapter Audio : Integrated Audio Chipset Slots : 1 PCI Express 1.1 x4(Half Length), 1 PCI Express 1.1 x4(Full Length), 2 PCI Express 2.0 x16 (Full Length), 1 PCI v2.3 (Full Length), 2 PCI-X (Full Length) Network : Integrated Intel PRO/1000 Gigabit Ethernet Ports : 6x USB 2.0(2 front; 4 rear), Ethernet Mouse, Keyboard, VGA, Line-out, Line-in, Microphone, Audio jack-in & Headphone-out Operating System : Windows Vista Business