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 Legacy Intel® Core™ Processor Intel Core i7-2xxx DIRECTIVE (EU) 2022/2380 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 23 November 2022 (Part III) y Lenovo ThinkPad W520, Intel® Core™ i7, 2.4 GHz, 39.6 cm (15.6"), 1600 x 900 pixels, 4 GB, 500 GB Lenovo ThinkPad W520. Processor family: Intel® Core™ i7, Processor model: i7-2760QM, Processor frequency: 2.4 GHz. Display diagonal: 39.6 cm (15.6"), HD type: HD+, Display resolution: 1600 x 900 pixels. Internal memory: 4 GB, Internal memory type: DDR3-SDRAM. Total storage capacity: 500 GB, Optical drive type: DVD±RW. On-board graphics card model: Intel® HD Graphics 3000, Discrete graphics card model: NVIDIA® Quadro® 1000M. Operating system installed: Windows 7 Professional. Product colour: Black. Weight: 2.61 kg http://www.itreviews.com/lenovo-thinkpad-w520/ The Lenovo ThinkPad W520 is not for the fainthearted. It's a very expensive laptop. However for the money you get an extremely sophisticated machine with a fantastic screen and a powerful Intel quad-core processor. Probably best suited to those intere... Wonderful screen, powerful processor, Rather expensive and fairly heavy. It doesn't come cheap, and the Lenovo ThinkPad W520 is really designed for graphics professionals and others who need a powerful portable with a super high-resolution screen. If you need these things, this is a superb computer. ... http://www.zdnet.co.uk/reviews/thin-and-light-laptops/2011/05/27/lenovo-thinkpad-w520-40092922/ Lenovo's ThinkPad W520 is a fast 15.6in. notebook with a high-quality display whose limited portability isn't helped by a brick-like AC adapter. If you do take the W520 on the road, then its battery performance ought to be adequate. The superb screen... Fabulous 15.6in. screen with colour calibrator, Highcapacity hard drive, Fast quadcore processor, Good battery life Cramped USB 3.0 ports, Bulky and heavy, No integrated mobile broadband https://www.techradar.com/reviews/pc-mac/laptops-portable-pcs/laptops-and-netbooks/lenovo-w520-957648/review Lenovo has built itself a strong corner in the business laptop market with its popular ThinkPad range. The ThinkPad W520 is a highly powerful business machine crammed with features, and is perfect for mobile professionals that use resource-hungry softw... Great performance, Bright Full HD screen, Excellent keyboard, Good features Battery life, Mobility