Lenovo ThinkPad X220. Processor clock speed: 2.60 MHz, L2 cache: 3 MB, Processor front side bus: 1333 MHz. Internal memory: 4000 MB, Memory clock speed: 1333 MHz, Memory slots: 2 SODIMM. Hard drive capacity: 320 GB, Hard drive interface: SATA, Hard drive rotational speed: 7200 RPM. Display diagonal: 317.5 mm (12.5 "), Display resolution: 1366 x 768 pixels. Maximum resolution: 1366 x 768 pixels