Lenovo E31, ThinkStation. Processor clock speed: 3300 MHz, Processor family: Intel Core i5, Processor model: i5-3550. Internal memory: 4096 MB, Internal memory type: DDR3, Memory slots: 4x DIMM. Hard drive capacity: 500 GB, Hard drive interface: Serial ATA. Graphic adapter: HD Graphics 2500, Graphics adapter family: Intel. Optical drive type: DVD-RW