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 Hard Drive HDD Intel® Xeon® processors deliver cloud computing, real-time analytics, processing for your mission-critical business, and big data insights. Improve data center efficiency and reliability to handle any workload. Intel Xeon E5 HP 420, 2.8 GHz, Intel® Xeon® E5 Family, 4 GB, 500 GB, DVD Super Multi, Windows 7 Professional HP 420. Processor frequency: 2.8 GHz, Processor family: Intel® Xeon® E5 Family, Processor model: E5-1603. Internal memory: 4 GB, Internal memory type: DDR3-SDRAM, Memory clock speed: 1866 MHz. Total storage capacity: 500 GB, Storage media: HDD, Optical drive type: DVD Super Multi. Operating system installed: Windows 7 Professional, Operating system architecture: 64-bit. Power supply: 400 W. Chassis type: Mini Tower. Product type: Workstation. Product colour: Black http://www.itreviews.com/hp-z420/ The HP Z420 ($2,768 direct) is a mid-level single processor workstation from HP. It has a good measure of expandability backing up its liquid cooled Intel Xeon processor and Nvidia Quadro workstation-class graphics. It was a speedy performer on our benchm... The HP Z420 combines a quad-core Intel Xeon processor with an Nvidia Quadro graphics to give you a powerhouse system that can grow along with your company....