Dell Precision T3600 Xeon Four Core E5 1607 Quadro 4000 16GB RAM 1TB HD Windows 7 Dell Precision T3600 Workstation 3.00GHz Intel Xeon Quad Core E5-1607 16GB RAM 1x TB 3.5" 7.2K Hard Drive 635W 80 Plus Gold (90% Efficient) / nVIDIA Quadro 4000 - Windows 7 Professional Installed