I can not get Quicktime to play MP4 movies smooth at all. Some parts, the less intense scens I guess my comp can hadle. Is it because the Rage Pro isn't supported by QE? I can get DV format videos to play better. Some times, well before I reinstalled for a 3rd time, MPG files would skip all over the place. The only true good play back comes from the 3ivx codec. Any suggestions?