The faster the GPU and slower the CPU the more benefit you are getting when using an OpenCL Application. An Highend MacPro 2009 with lowend GPU isnt really useful for OpenCL, because their great new CPU´s reach near lowend GPU OpenCL speed.
But on an Core2Duo even an ATI 4850 or more...
- Apple updated OpenCL API usage
- ATI 48xx should work
- Mac OS X 10.6
- OpenCL GPUs:
- ATI 48xx
- Nivida 8xxx(M)/9xxx(M)