Acer AM3400-U2052 Desktop (Black) (Discontinued by Manufacturer) Redesigned with a fresh new look and feel, the Acer AM3400 series Desktop features a cool illuminated blue power effect that runs alongside the edge of the machine and amazing built-in convenience features. AMD Phenom II Quad-Core processor delivers the ultimate visual experience for high definition entertainment and advanced multitasking performance. ATI Radeon HD 5450 graphics deliver break-through efficiency with cutting-edge performance and new energy-saving features. 6 GB DDR3 Memory delivers incredible system response to effortlessly play intense games, multitask and run the latest multi-threaded applications. Windows 7 Home Premium 64-bit operating system is designed to be more reliable, more responsive, and to make the things you do every day easier - the best entertainment experience on your PC.