The 9.1.2 version has been neutered to get Apple's Seal of Approval for inclusion. To whit, they had to yank CUDA support and make it run 100% with OpenCl. I have it on good authority that it literally runs half as fast as getting the 9.1.1 version direct from BMD's site. Apple's arm twisting is getting ugly. Current Mac Pros ship with AMD cards that can't do CUDA, so they don't want any "rogue" types having a better experience. If you can't beat 'em, kneecap 'em. Imagine if they ever get 100% control of all Mac software. I'm trying to remember what the theme was of that 1984 commercial they did....big brother.....knows best....guess it was all tongue-in-cheek.