Dell OptiPlex 790 DT SFF Desktop Computer Intel Core i5 i5-2400 3.10 GHz Desktop 4GB RAM 250GB HDD DVD-Writer DVDRW Windows 7 Professional 64-bit (English) (CertifiedRefurbished) This CertifiedRefurbished 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 warrantty, and may arrive in a generic box. Only select sellers who maintain a high performance bar may offer CertifiedRefurbished products on Amazon.com Dell 790 Intel I5 Quad-Core 3.1 GHz Processor What's Inside: 4GB RAM, 250GB Hard Drive, DVW Optical Drive, Operating System: Windows 7 Professional