Ok, as configured you should be able to run the game(s) with a great balance of visuals and performance at 1080p. I would adhere to my first response and start there; making sure that your drivers are up to date and that any patches for the games have been downloaded. the processor you're using is good enough to run the game, better than what's required at the minimum, but certain elements could bog it down, such as shader optimization, physics and if there's a lot of action going on at once.
keep your resolution maximized and work your way down, lowering and disabling visual settings as you go. if you find that there is no or little difference, the problem may not be the graphics card and/or drivers.
