Lenovo Computer Xeon 12 Core w turbo up to 2.5Ghz,16GB RAM (exp. to 256GB), 500GB HDD, DVDRW, Win 7 64 bits Prof. 64 bits,Re-certificated to new, Manufacture warranty (2) Xeon 6 Core - 2.5Ghz (total 12 core) 16GB Ram Installed, and will support up to 256GB RAM NVIDIA Quadro 2000D 1GB graphic card scored excellent marks for 3D rendering with display (coming with two DVIs) Power supply90% Efficient 800W Windows 7 64 bits Professional