HP Pavilion 500-054 Desktop AMD Quad-Core A8-5500 Accelerated Processor with AMD Radeon HD 7560D graphics 8GB PC3-12800 DDR3 SDRAM 1.5TB Serial ATA hard drive (7200 rpm) AMD Radeon HD 7560D graphics Microsoft Windows 8 operating system preinstalled, 4 USB 3.0 and 4 USB 2.0 ports