http://www.nvidia.com/object/macosx-270.00.00f01-driver.html You may have to right-click and install pieces separately but I just realized that using these drivers allow you to run most Nvidia cards in Mac Pro. You won't have boot screens, but just like many ATI cards, you WILL have normal function once you reach desktop. Should work with 9400GT to GTX580 and everything in between. Nvidia is joining the "all cards work now" bandwagon. Can't be an accident that within a year, ALL video cards now work, no injection needed. They are trying to make it easier, just not sure if it is Apple or Nvidia/AMD. Somebody wants these cards to work.