Lenovo ThinkCentre M55e, 1.86 GHz, Intel® Core™2 Duo, 1 GB, 160 GB, DVD-ROM, Windows XP Professional Lenovo ThinkCentre M55e. Processor frequency: 1.86 GHz, Processor family: Intel® Core™2 Duo, Processor: E6300. Internal memory: 1 GB, Internal memory type: DDR2-SDRAM, Memory clock speed: 667 MHz. Total storage capacity: 160 GB, Optical drive: DVD-ROM. Operating system installed: Windows XP Professional. Power supply: 225 W. Form factor: SFF. Product type: PC. Weight: 8.5 kg. Product colour: Black