Processor: Intel i5 Quad Core Gen 3 3.40 GHz. Installed Memory: 16GB DDR3. Hard Drive: 500GB SATA. Operating System: Windows 10 Professional 64 bit. This computer is ready to use straight out of the box. It has gone through a rigorous refurbishing process as well as Quality Control Testing. First we erased all of the previously stored data according to DOD standards. Then we replaced any failing or bad hardware including the hard drive memory and capacitors. We have verified that all of the ports and connectors are in proper working order. Save Time with the freshly installed digital product key for Windows 10 operating system. No more keying in 25 tiny hard to see characters or loading time to activate. It will automatically activate once the license agreement is accepted with the click of a mouse.