I purchased  the Dell Optiplex 990 Tower High Performance Business Desktop Computer, Intel Quad Core i5 up to 3.4GHz Processor, 8GB RAM, 2TB HDD, DVD, WiFi, Windows 10 Pro 64 Bit - I set up the computer and everything worked great out of the box -  all but the mouse - the roller did not work, contacted seller and they got back to me same day and shipped another mouse.  All was working great and about a week into the purchase I turned on the computer and nothing worked, ran diagnostics which took several hours after it finished I rebooted and the computer went through several stages of "fix it" the computer shut down restarted and everything works exceptionally well.  I understand it is refurbished but for the price and the afternoon of inconvenience well worth it!  I would purchase this item again.  The mouse and keyboard sub-standard but these are minor to replace. So far so good!  I don't do any gaming on this computer so I did not rate the  gaming stars.