Lenovo ThinkCentre 70Z, 48.3 cm (19"), Intel® Core™2 Duo, 4 GB, 500 GB, Windows 7 Professional, Black Lenovo ThinkCentre 70Z. Display diagonal: 48.3 cm (19"). Processor family: Intel® Core™2 Duo, Processor frequency: 3.06 GHz. Internal memory: 4 GB, Internal memory type: DDR2-SDRAM. Total storage capacity: 500 GB. Discrete graphics card model: Intel® GMA X4500. Optical drive type: DVD-RW. Operating system installed: Windows 7 Professional. Product colour: Black