V-Sync on or Fast with Sims 3?

Fast Sync is kind of new for the more powerful cards. From what I understand, it's sort of a "lite" version of fps capping without forcing the game and the monitor to actually stay in sync at all times. I wouldn't recommend it for TS3 unless you are getting consistent and wild frame rates in the high hundreds or thousands and your system seems to be struggling too much to maintain vert sync when set to On or Adaptive. I suspect it's really more for first person shooter types of games where the fps rates can get more carried away during routine play than randomly fluctuating all over the place like TS3 can tend to do.