Intel® Pentium® Intel Pentium Lenovo ThinkCentre M91, 2.6 GHz, Intel® Pentium®, 2 GB, 320 GB, DVD-RW, Windows 7 Professional Lenovo ThinkCentre M91. Processor frequency: 2.6 GHz, Processor family: Intel® Pentium®, Processor model: G620. Internal memory: 2 GB, Internal memory type: DDR3-SDRAM, Memory clock speed: 1333 MHz. Total storage capacity: 320 GB, Storage media: HDD, Optical drive type: DVD-RW. On-board graphics card model: Intel® HD Graphics. Operating system installed: Windows 7 Professional, Operating system architecture: 64-bit. Product type: PC. Product colour: Black