HP Smart Buy Z620 Workstation; 800W 90% Efficient Chassis; Intel Xeon E5-1620v2 3.70Ghz 10MB 1866 4C CPU (Single CPU only); 1TB 7200 RPM SATA Hard Drive; 4GB DDR3-1866 ECC (1x4GB) Unbuffered RAM; 16X SuperMulti DVDRW SATA ODD; HP Smart Buy USB Keyboard/USB Optical Mouse; No integrated grahics. Choose your 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.