HP Z400 Workstation - Quad Xeon 2.4GHz - 2TB 7200RPM HDD - 6GB RAM - WIFI - Quad Monitor Output- DVD/CD-RW - Windows 7 Pro 64 (Certified Refurbished) Certified Refurbished product has been tested and certified by the manufacturer or by a third-party refurbisher to look and work like new, with limited to no signs of wear. The refurbishing process includes functionality testing, inspection, reconditioning and repackaging. The product ships with relevant accessories, a 90-day warranty, and may arrive in a generic white or brown box. Accessories may be generic and not directly from the manufacturer.