HP Z220 Convertible Minitower Workstation; CMT 400W 90% Efficient Chassis; Intel Core i7-3770 3.4 GHz (up to 3.9 GHz) 8MB 77W GT2 4C HT CPU; 1TB 7200 RPM SATA 6G Hard Drive; 8GB DDR3-1600 non-ECC (2x4GB) Unbuffered RAM; 16X SuperMulti DVDRW SATA ODD; HP USB Keyboard/USB Optical Mouse; Intel HD Graphics 4000; Windows 7 Professional 64 installed with Windows 8 Professional License; HP Energy Star 5.0 Enabled Configuration; Limited 3 years parts, 3 years labor, and 3 years onsite service (3/3/3) standard warranty.