HP Smart Buy Z230 Tower Workstation; Tower 320W Standard Efficiency Chassis; Intel Core i3-4160 3.6 3M GT1 2C CPU; 500GB 7200 RPM SATA Hard Drive; 4GB DDR3-1600 non-ECC (1x4GB) Unbuffered RAM; Slim 8X SuperMulti DVDRW SATA ODD; HP USB Keyboard/USB Optical Mouse; Intel HD Graphics 4400; 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.