HI.. I have not installed any additional drivers as I have the mac edition gtx680 and supposedly dont need any in mac os? I responded in your other thread as well. If I am missing something I wish someone would fill me in... But this just isnt working well at all. I need Smooth tear free video... not getting it. Same files etc in SL with even an AMD card, and certainly quadro are far superior in playback quality. If there is a fix I need to know now! Sad as they seemed to have also fixed the poor performance with amd cards in ML but same tearing issues etc.