Lenovo ThinkCentre M700 10GT002MUS Desktop (3.40 GHz Intel Core i7-6700, 8 GB RAM, 1 TB HDD, DVD-Writer, Windows 7 Pro) Black CPU: Intel Core i7 (6th Gen) i7-6700 3.40 GHz - RAM: 8 GB DDR4 SDRAM Storage: 1 TB HDD - DVD-Writer OS: Windows 7 Professional 64-bit (English) upgradable to Windows 10 Pro Warranty: 3-year, onsite