Dell Optiplex, Intel Core 2 Duo 3.0 GHz 4GB Memory/160GB HDD, Windows 10 Professional (Certified Refurbished) This computer has been certified refurbished by a Microsoft Authorized Refurbisher, ensuring the highest levels of quality and support. Dell 780 Core 2 Duo 3.0 GHz Processor What's Inside: 4GB RAM, 160GB Hard Drive, DVW Optical Drive, Operating System: Windows 10 Professional