Dell Optiplex 790 Business Computer PC (Intel Quad-Core i5-2400 3.1GHz, 4GB DDR3 Memory, 250GB HDD, DVD-ROM, Windows 7 Professional) (Certified Refurbished) This Certified Refurbished product is tested and certified to look & work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with relevant accessories, and may arrive in a generic box. Only select sellers who maintain a high performance bar may offer Certified Refurbished products on Amazon.com Runs: Windows 7 USB Keyboard, Mouse, Integrated Audio, 10/100/1000Mbps LAN; Slots: 10 x USB 2.0 ports, 2 x audio-out jacks, 1 x microphone jack, 1 x RJ-45 Ethernet port, 1 x VGA port, 1 x line-in jack, 1 x parallel port, 1 x serial communication port; 4GB DDR3 (PC3-12800) Memory (4 slots, supports up to 16GB), 250GB 7200 rpm Hard Drive Processor: Intel Core Quad-Core i5-2400 3.1GHz (Turbo up to 3.4GHz) 6MB Cache