If you see a decline in performance after 2 mins of gaming you need to monitor your gpu & cpu temperatures as that sounds like possible thermal throttling
Could you set GPU-Z to log to a file then send a zippyshare or dropbox link to the file?
when I play on max quality it seems to have min fps drops (like 20 max)
when I go to low res, min quality. it doesn't seem to have more fps. (w/ fps set to max 999)
is there any reason for this.
my fps seems fixed at high res, but not at low res
Set the refresh rate to 0.1 seconds, and make a game go into windowed mode, so you can screenshot GPU-Z while playing the game, but from the looks of it, your GPU Load is really load.