Lenovo ThinkStation D20 (4155-79G), DE, 2.26 GHz, Intel® Xeon® 5000 Sequence, E5507, 3 GB, DVD-RW, Windows 7 Professional Lenovo ThinkStation D20 (4155-79G), DE. Processor frequency: 2.26 GHz, Processor family: Intel® Xeon® 5000 Sequence, Processor model: E5507. Internal memory: 3 GB, Internal memory type: DDR3-SDRAM, Memory clock speed: 1066 MHz. Card reader integrated, Optical drive type: DVD-RW. Operating system installed: Windows 7 Professional. Power supply: 1060 W. Chassis type: Tower. Product type: Workstation. Weight: 54.9 lbs (24.9 kg) https://www.pcmag.com/review/296032/lenovo-thinkstation-d20 The Lenovo ThinkStation D20 is one of those systems that you know you will need. Are you building components for weapons systems that directly related to national defense? Are you in the editing and mastering stage of a $250 million Hollywood movie? Do yo... Two quad-core processors. Speedy 15,000 rpm hard drive. Lots of expansion room. Workstation-class everything. Has eSATA and FireWire. It's big. It's pricey. Could use USB 3.0 The Lenovo ThinkStation D20 is a specialized dual-CPU workstation for the engineering, scientific, and Hollywood crowds. It's the big weapon in the arsenal, made for your heavy-hitting users with mission-critical tasks.... John Virata Lenovo's D20 is the company's top of the line ThinkStation workstation. This particular model shipped with dual Intel E5540 2.53GHz Xeon processors (four processor cores), 12GB RAM, and Windows 7 Professional. Graphics was powered by an NV...