HP Smart Buy Z420 Workstation; 600W 90% Efficient Chassis; Intel Xeon E5-1620v2 3.70Ghz 10MB 1866 4C CPU; 500GB 7200 RPM SATA 6G Hard Drive; 8GB DDR3-1866 ECC (1x8GB) Unbuffered RAM; 16X SuperMulti DVDRW SATA ODD; HP Smart Buy USB Keyboard/USB Optical Mouse; NVIDIA Quadro K2000 2GB Graphics; Windows 7 Professional 64 installed with Windows 8.1 Professional License; ENERGY STAR Qualified Configuration; Limited 3 years parts, 3 years labor, and 3 years onsite service (3/3/3) standard warranty.