xxx (1) Intel Pentium G640 2.8GHz Processor; runs most programs and applications 4GB 1333MHz DDR3 Memory; delivers faster, smoother multitasking 500GB 7,200RPM SATA Hard Disk Drive; stores up to 500GB of data DVDRW Dual Layer optical drive; reads and writes data on DVDs RJ-45 Interface; connects the PC to a network device Genuine Windows 7 Home Premium 64-bit. Microsoft Windows 7 Home Premium 64-bit operating system preinstalled Provides a stable computing platform. Lenovo Enhanced Experience 2.0 for Windows 7 Intel HD Graphics 2 USB 3.0 & 6 USB 2.0 connectors 16-in-1 media reader Supports Memory Stick, Memory Stick PRO, Memory Stick Duo, Memory Stick PRO Duo, Secure Digital, miniSD, Secure Digital High Capacity, miniSDHC, xD-Picture Card, Microdrive and CompactFlash I/II formats. Support for 7.1 channel digital surround sound Power Control Switch with halo lighting effect - choose between performance, dynamic and silent running modes Convenient top-mounted power button Lenovo Rescue System makes data backup and recovery simple so you can spend time on more enjoyable tasks Tool-free chassis design for easy upgrade and maintenance HDMI Out Port Mouse and Keyboard Included Built-in 10/100/1000 Gigabit Ethernet LAN For quick and easy wired Web connection. Intel Pentium processor Features classic 2-way processing performance, letting you run multiple applications simultaneously, so you can browse, send instant messages, download music and transfer photos all at once. Software package included With Microsoft Office Starter 2010. Microsoft Office Starter 2010 gives home users who are buying preloaded PCs the ability to perform the most common and basic productivity tasks right out of the box. Office Starter consists of Microsoft Word Starter 2010 and Microsoft Excel Starter 2010 only.