Update:

Got my dual 2.8Ghz Mac Pro with 8800GT, wouldn't buy a nVIDIA card ever again! The main machine is grand but the 8800GT exhibits the worst screen tearing in OpenGL apps ever! Then again, it could just be the complete lack of driver control / support on Apples part! 'Parently the Quadro card is the same!

Moving models around in Maya causes hellish tearing, with objects splitting in half about 1/3rd from the top of the screen! Looks like a VSYNC issue. Tried all the beam sync options, no go....Oh well, I'll have to wait for an update, maybe 10.5.7 will fix things! :zzz:

-Jacques