All the speed tests we’ve done with Beauty Box on Windows show the Nvidia GeForce video cards to outpace their much more expensive cousins, the Quadros, significantly. A GTX 570 (~$270) 
Since Beauty Box can involve some render time, we’ve wished that Apple would authorize one of the newer GeForce cards for the Mac. No such luck. So we’re tired of waiting. We took a stock PNY GeForce 570 and put it into our MacPro. And lo! It works!
So… what’d we do and what are the caveats? This was not a 570 with ‘flashed’ ROM. This was just a straight up 570 which we use in one of our PC machines. Nothing fancy. We did need to download a few things:
– Latest Nvidia driver for the Mac, which can be found here: http://www.nvidia.com/object/macosx-304.00.05f02-driver.html
– Latest CUDA drivers for the Mac, which can be found here: http://www.nvidia.com/object/mac-driver-archive.html (as of this writing, v5.0.37 was the latest)
– If you’re using Premiere you need to update the cuda_supported_cards.txt file to add the name of the video card. In this case it would be: ‘GeForce GTX 570’ To do this, you need to go to the Premiere.app file, right+click on it and select ‘Show Package Contents’. Once you do that, this is what you’ll see:
Once that’s done, you are good to go!
Now that caveats…