Dell Optiplex 780 DT High Performance Business Desktop Computer PC (Intel Dual-Core Processor up to 3.0GHz, 8GB DDR3 RAM, 750GB HDD, DVDRW, Windows 7 Professional) (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 Dual Core 2 Duo Processor with 6M Cache, 3.0 GHz 8GB DDR3 (PC3-12800) RAM Memory, 750GB 7200 rpm Hard Drive, Intel HD Graphics; DVD ROM, USB Keyboard, Mouse, Integrated Audio, 10/100/1000Mbps LAN; Slots: 8 x USB 2.0 (2 front, 6 rear), 1 VGA, 1 RJ-45, 1 Serial port, 1 Parallel port, 1 x VGA, 1 x Ethernet (RJ-45), 2 x 3.5mm audio line-in, 2 x 3.5mm audio line-out; 1 PCI, 1 PCI Express x16 Windows 7 Professional 64 bit, Activation code is on the tower; the best operating system for business; Restore Partition on HDD with F11