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 DisplayPort 1 Hard Drive HDD HP ProDesk 405 G2 MT, 2 GHz, AMD A4, 4 GB, 500 GB, DVD Super Multi, Windows 7 Professional HP ProDesk 405 G2 MT. Processor frequency: 2 GHz, Processor family: AMD A4, Processor model: A4-6250. Internal memory: 4 GB, Internal memory type: DDR3-SDRAM, Memory clock speed: 1600 MHz. Total storage capacity: 500 GB, Storage media: HDD, Optical drive type: DVD Super Multi. On-board graphics card model: AMD Radeon HD 8330. Operating system installed: Windows 7 Professional, Operating system architecture: 64-bit. Power supply: 180 W. Chassis type: Micro Tower. Product type: PC