IF that is all your planning to play, how can upgrading anything be useful at this point? Those are low end games made to be run on the lowest performing systems, from what I seen of them. Now there is the whole 'twitch' crowd that demands in both games that they be running minimumally "250FPS or better" which is silly, but they swear without it they can't 'twitch' jump insta kill without such performance and willing to run the game at the "lowest crappiest visual settings to gain FPS without performance impact" .
Again it is meet your demands question. If your saying your doing MORE FPS than your monitor (common monitors only do 60HZ, which means any FPS over 60 is DROPPED) can handle (even a 144HZ would be dropping 6FPS to as much...