Wow, even this older (Gen 4) i5-4570 quad-core CPU is super-fast running Windows 10, Office, and Google Chrome with several documents and websites opened.  And 16 GB RAM is icing on the cake.  The compact case is very nice and packed full of goodies, like tons of ports, including two display ports and a VGA port.  I'm running one 24" monitor using a display port-to-DVI cable.  The sharpness is noticeably better than on my old entry-level Vostro PC.  FYI, after a couple weeks, I replaced the perfectly fine 500 GB conventional drive with a Samsung EVO 860 500 GB SSD (because I just had to try it).  The internal drive bay is designed for a 3.5" drive, so you'll need to get a 2.5" adapter bracket, which cost me around $6.  Connections are the same for both drives.Update: So here we are more than five years later, and this OptiPlex is still working great.  That's pretty darn good for a PC that was made in 2013.  Not a single problem and still more than fast enough for web browsing and Office 365.  Just this week I ordered another "renewed" PC.  This time a Dell Latitude 7400 office grade laptop to take with me on trips. I'm hoping it serves me as well as my OptiPlex.