Lenovo ThinkPad X31, 1.6 GHz, 12.1", 1024 x 768 pixels, 0.25 GB, 40 GB, Windows XP Professional Lenovo ThinkPad X31. Processor frequency: 1.6 GHz. Display diagonal: 12.1", Display resolution: 1024 x 768 pixels. Internal memory: 0.25 GB, Internal memory type: DDR-SDRAM. Total storage capacity: 40 GB. Discrete graphics card model: AMD Mobility Radeon 7000. Operating system installed: Windows XP Professional. Weight: 3.62 lbs (1.64 kg)