Dell Optiplex 780 Desktop - Fast and Powerful 3.0 GHz Intel Core 2 Duo Processor - 4GB DDR3 High Performance Memory - 160GB SATA Hard Drive - DVDROM (Certified Refurbished) This Certified Refurbished product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with all relevant accessories, a minimum 90-day warranty, and may arrive in a generic box. Only select sellers who maintain a high performance bar may offer Certified Refurbished products on Amazon.com Intel Core2 Duo 2.93GHz, 4GB DDR3 RAM, 160GB HDD,DVD ROM - Operating System: Windows 7 Pro 64 Bit Comes with a free WIFI USB ADAPTER To Allow Wireless Internet Use The premier OptiPlex 780 is Dell's most powerful and flexible desktop solution designed for best-in-class performance and collaboration, while enabling business-class control. It delivers premier technology that helps simplify systems management and security that blend seamlessly into office environments/ Home use Convenient onscreen access to your peripherals through the available plug-and-play