Lenovo 91z, ThinkCentre. Processor clock speed: 3.4 GHz, Processor family: Intel Core i3, Processor model: i3-2130. Internal memory: 4 GB, Maximum internal memory: 8 GB, Internal memory type: DDR3-SDRAM. Total storage capacity: 500 GB. Optical drive type: DVD Super Multi. Display diagonal: 546.1 mm (21.5 "), Aspect ratio: 16:9