All done in OS X Snow Leopard.
Doing a bit of testing on CS6. I had to install CUDA drives to enable to GPU support which was greyed out to start. I was thinking the GPU would be even faster than software only (CPU).
Looks like I was wrong.
R3D playback on preview from my bid at 1/2 is smooth in CPU software only but with GPU enabled for playback, I get only 1/4, 1/2 way too jumpy.
My GPU = GTX 285 1GB RAM
My CPU = 2x 2.93 Quad Core Intel Xeon
Conclusion: My software mode is more robust than my GPU mode?
I assume Ram has little to do with preview? I guess it makes sense, my CPU is a powerhouse, yet everyone raves about GPU CUDA for the mercury playback engine, just wondering if I'm skipping something.