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 Legacy Intel® Core™ Processor Intel Core i3-2xxx Hard Drive HDD HP Pro 3420, 50.8 cm (20"), HD+, Intel® Core™ i3, 4 GB, 500 GB, Windows 7 Professional HP Pro 3420. Display diagonal: 50.8 cm (20"), HD type: HD+, Display resolution: 1600 x 900 pixels. Processor family: Intel® Core™ i3, Processor frequency: 3.3 GHz. Internal memory: 4 GB, Internal memory type: DDR3-SDRAM. Total storage capacity: 500 GB, Storage media: HDD. On-board graphics card model: Intel® HD Graphics 2000. Built-in camera. Optical drive type: DVD Super Multi. Operating system installed: Windows 7 Professional. Product colour: Black