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 Intel® Pentium® Intel Pentium G DisplayPort 1 Hard Drive HDD HP ProOne 400 G1, 49.5 cm (19.5"), HD+, Intel Pentium G, 4 GB, 500 GB, Windows 7 Professional HP ProOne 400 G1. Product type: All-in-One PC. Display diagonal: 49.5 cm (19.5"), HD type: HD+, Display resolution: 1600 x 900 pixels. Processor family: Intel Pentium G, Processor frequency: 2.7 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. Built-in camera. Optical drive type: DVD Super Multi. Operating system installed: Windows 7 Professional. Product colour: Black, Silver