HP - Slimline Desktop - Intel Pentium processor J2900 / 4GB Memory / 1TB Hard Drive / Microsoft Windows 8.1 operating system preinstalled / Black Intel Pentium processor J2900 4GB DDR3L SDRAM 1TB Serial ATA hard drive (7200 rpm) SuperMulti DVD/CD burner Windows 8.1 64-bit / 5 high-speed USB 2.0 ports / 802.11b/g/n WLAN