Just downloaded the latest ForceWare the 91.45 that supports Quad SLI and Voila it activated the Transparency AA option in the control panel the feature realy works and the difference can be seen in almost every game that i played.All you have to do is instal the latest driver 91.45 and you have Transparency AA.Why didn't Nvidia male this feature available from the start?and why now?.Now i don't know if it will work for all video cards but for the 6600gt agp it works just fine