CUDA Application Support:
In order to run Mac OS X Applications that leverage the CUDA architecture of the NVIDIA GPU, you will need to download a runtime CUDA driver. There are specific CUDA versions depending on which driver/OS version you are using with the Quadro FX 4800 for Mac or the GeForce GTX285 for Mac:
To run CUDA applications with Mac OS X v10.6.4 Snow Leopard, please download and install the CUDA 3.1 driver for Mac located here
New in Release 256.00.05a23
* This driver update is for Mac Pro (Mid 2010) only, whose owners would like to use NVIDIA Quadro FX 4800 for Mac or NVIDIA GeForce GTX 285 for Mac video cards.
* It’s an improved driver with more bug fixes than the driver that is included with the Mac Pro (Mid 2010) system.