Dell Optiplex 7010 SFF Desktop Business Computer PC (Intel Quad-Core i5-3470 3.2GHz,16GB DDR3 Memory, 2TB 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 Processor: Intel Quad-Core i5-3470 3.2GHz (Turbo up to 3.6GHz) 6MB Cache 16GB DDR3 (PC3-12800) Memory, 2TB 7200 rpm Hard Drive, Intel HD Graphics; SuperMulti DVDRW Drive (Reads and Writes to DVD/CD), USB Keyboard, Mouse, Integrated Audio, 10/100/1000Mbps LAN; Slots: 6 x USB 2.0 ports, 4 x USB 3.0 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; windows 7 professional, Activation code is on the tower; the best operating system for business