The mac pro is at work, the GTX 280 is mine. It works fine in a real mac pro. My goal is to get it going in OSX 86. I got snow kitty going or at least booting in a hack but it seems to work fine for about a minute then Apps start crashing till I get an unusable system, so until I can get things stable, the 280 is on hold. Certainly, dropping the Snow drivers into Leo does not work as Snow is functionally very different and QE & CI do not function.