-crap power supply
-not so good case.
-no difference between 2 different OSs for gaming
-if you dont overclock, you can still play at top settings for most things
-680s are a terrible value. a 670 performs the same out of the box. a 7950 performs around a 670 mark but for cheaper and comes with 3 good games
get this insteadhttp://pcpartpicker.com/p/rKhM