In case this is needed, here is a graphic on how to set up the Nvidia Control Panel for vertical sync and to cap the fps.
http://forums.thesims.com/en_US/discussion/comment/15007970#Comment_15007970
Note that this method only works in full screen mode. If the fps does not stay locked in, as can be seen by using the fps on cheat code in-game, or if windowed mode is required, then we move on to Nvidia Inspector or other tools such as RivaTuner Stats Server (RTSS).
Back on the RAM usage, it can be surprising how much in the way of resources Chrome might be "using" even if you don't have any browser windows or tabs open. Always worth checking on that in Task Manager as well; in particular, how much of that 8 GB is actually available for use while the game is still running at 2.something or 3 GB. But if you have plenty to work with still, then of course we can rule that out.