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 i5-2xxx DELL OptiPlex 390, 3.1 GHz, Intel® Core™ i5, 4 GB, 500 GB, DVD-RW, Windows 7 Professional DELL OptiPlex 390. Processor frequency: 3.1 GHz, Processor family: Intel® Core™ i5, Processor model: i5-2400. Internal memory: 4 GB, Internal memory type: DDR3-SDRAM, Memory clock speed: 1333 MHz. Total storage capacity: 500 GB, Optical drive type: DVD-RW. On-board graphics card model: Intel® HD Graphics 2000. Operating system installed: Windows 7 Professional, Operating system architecture: 64-bit. Power supply: 240 W. Chassis type: SFF. Product type: PC. Product color: Black https://www.alphr.com/dell/dell-optiplex-390/31747/dell-optiplex-390-review The Optiplex 390 can be purchased in several form factors: as a mini tower, desktop, or as in this case, a mini desktop PC. In the last form, the Optiplex 390 is compact and feels solid and rugged enough for any classroom, which you'd expect when it weigh... It might not be the most exciting mini desktop PC, but it's one of the most cost-effective and practical... https://www.alphr.com/dell/dell-optiplex-390/31701/dell-optiplex-390-review First impressions of this low-cost PC are impressive. It looks stylish and its black metal case makes it look and feel more expensive than it is. The Optiplex 390 weighs close to 8kg, but it looks relatively slim when used in a vertical position, and feel... A stylish, solid all-rounder, offering good performance at a decent price...