HP Z420 Workstation; 400W 90% Efficient Chassis; Intel Xeon E5-1607v2 3.00Ghz 10MB 1600 4C CPU; 500GB 7200 RPM SATA 6G Hard Drive; 4GB DDR3-1866 ECC (1x4GB) Unbuffered RAM; NVIDIA Quadro K600 1GB Graphics; 16X SuperMulti DVDRW SATA ODD; HP USB Keyboard/USB Optical Mouse; 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.