Lenovo ThinkCentre M51, ThinkCentre. Processor clock speed: 3 GHz, Processor family: Intel Pentium 4, Processor front side bus: 800 MHz. Internal memory: 0.5 GB, Maximum internal memory: 4 GB, Internal memory type: DDR-SDRAM. Total storage capacity: 40 GB, Hard drive rotational speed: 7200 RPM, Hard drive interface: Serial ATA. Discrete graphics adapter model: GMA 900. Audio system: SoundMAX Cadenza