Lenovo ThinkStation E20 + ThinkVision L2321x, 2.53 GHz, Intel® Xeon® 3000 Sequence, X3440, 4 GB, Windows 7 Professional, 64-bit Lenovo ThinkStation E20 + ThinkVision L2321x. Processor frequency: 2.53 GHz, Processor family: Intel® Xeon® 3000 Sequence, Processor model: X3440. Internal memory: 4 GB, Internal memory type: DDR3-SDRAM, Memory clock speed: 1333 MHz. Operating system installed: Windows 7 Professional, Operating system architecture: 64-bit. Power supply: 280 W. Chassis type: Tower. Product type: Workstation. Weight: 11.2 kg