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 RoHS stands for Restriction of Hazardous Substances. RoHS, also known as Directive 2002/95/EC, originated in the European Union and restricts the use of specific hazardous materials found in electrical and electronic products (known as EEE). All applicable products in the EU market after July 1, 2006 must pass RoHS compliance. The substances banned under RoHS are lead (Pb), mercury (Hg), cadmium (Cd), hexavalent chromium (CrVI), polybrominated biphenyls (PBB), polybrominated diphenyl ethers (PBDE), and four different phthalates (DEHP, BBP, BBP, DIBP). RoHS <b>Higher Performance When You Need It Most</b> Intel® Turbo Boost Technology 2.01 accelerates processor and graphics performance by increasing the operating frequency when operating below specification limits. The maximum frequency varies depending on workload, hardware, software, and overall system configuration. 2.0 Solid state drive hdd+ssd 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, 3.6 GHz, Intel® Xeon® E5 Family, 32 GB, 756 GB, DVD Super Multi, Windows 7 Professional HP 420. Processor frequency: 3.6 GHz, Processor family: Intel® Xeon® E5 Family, Processor model: E5-1620. Internal memory: 32 GB, Internal memory type: DDR3-SDRAM, Memory clock speed: 1600 MHz. Total storage capacity: 756 GB, Storage media: HDD+SSD, Optical drive type: DVD Super Multi. Discrete graphics card model: NVIDIA® Quadro® K2000. Operating system installed: Windows 7 Professional, Operating system architecture: 64-bit. Power supply: 600 W. Chassis type: Mini Tower. Product type: Workstation 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....