Lenovo ThinkCentre M58P Ultra Small Form Factor High Performance Desktop Computer (Intel Core 2 Duo E8400 3.0GHz, 4GB RAM, 250GB HDD, 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 Core 2 Duo E8400 3.0GHz 6MB L2 Cache; Memory: 4GB DDR3; supports up to 8GB, 2 slots Hard Drive: 250GB (7200rpm) SATA; Graphics: Integrated Intel GMA 4500; Video Ports: VGA, DisplayPort; Network: 10/100/1000 Gigabit Ethernet Front Ports: (2) USB 2.0, (1) Headphone, (1) Microphone; Rear Ports: (6) USB 2.0, (1) VGA, (1) DisplayPort, (1) RJ-45, (1) Audio-in, (1) Audio-out; Expansion Slots & Bays: (1) Low-Profile PCI Slot, (1) External 3.5-inch bay, (1) Internal 3.5-inch bay, Genuine Windows 7 Professional (64-bit); USB Mouse and Keyboard