HP Smart Buy Z640 Workstation; 925W 90% Efficient Chassis; TWO (2) Intel Xeon E5-2620v3 2.4 1866 6C CPU; 1 TB 7200 RPM SATA Hard Drive; 16GB DDR4-2133 (2x8GB) RegRAM; Slim SuperMulti DVDRW; HP USB Keyboard/USB Optical Mouse; No integrated graphics - choose your professional graphics; Windows 7 Professional 64 installed with Windows 8.1 Professional License; Limited 3 years parts 3 years labor and 3 years onsite service (3/3/3) standard warranty.