HP Z400 + WS094ET, 2.4 GHz, Intel® Xeon® 3000 Sequence, W3503, 3 GB, DVD Super Multi, Windows 7 Professional HP Z400 + WS094ET. Processor frequency: 2.4 GHz, Processor family: Intel® Xeon® 3000 Sequence, Processor model: W3503. Internal memory: 3 GB, Internal memory type: DDR3-SDRAM, Memory clock speed: 1333 MHz. Card reader integrated, Optical drive type: DVD Super Multi. Operating system installed: Windows 7 Professional, Operating system architecture: 32-bit. Power supply: 475 W. Chassis type: Minitower. Product type: Workstation. Weight: 43.2 lbs (19.6 kg)