ENERGY STAR® is the government-backed symbol for energy efficiency, providing simple, credible, and unbiased information that consumers and businesses rely on to make well-informed decisions. ENERGY STAR is the simple choice for energy efficiency, making it easy for consumers and businesses to purchase products that save them money and protect the environment. ENERGY STAR HP Z600 Workstation, 2.66 GHz, Intel® Xeon® 5000 Sequence, X5650, 6 GB, DVD Super Multi, Windows 7 Professional HP Z600 Workstation. Processor frequency: 2.66 GHz, Processor family: Intel® Xeon® 5000 Sequence, Processor: X5650. Internal memory: 6 GB, Internal memory type: DDR3-SDRAM, Memory clock speed: 1333 MHz. Optical drive type: DVD Super Multi. Operating system installed: Windows 7 Professional, Operating system architecture: 64-bit. Power supply: 650 W. Chassis type: Minitower. Product type: Workstation. Weight: 15 kg