having just messed with this for way too long yesterday I must say that I prefer rivatuner far before CCC. The problem I had was trying to use both (whoops) and CCC trumps Riva. My Riva doesn't change the clock for 2d settings though, and I'm not sure if that's normal. The fan control on Riva is amazing though, just mess with the Tmin, max and slope and the temps stay right where you want them.