I have noticed this myself but haven't seen a thread here. A quick googling showed several hits. Does anyone have backup info or conflicting reports? (i.e., "you're a moron Dave, just rendered 'Titanic 2' using CUDA on a GTX285 in 10.9") My feeling is that this is an oversight somewhere between Nvidia and Apple driver teams. It is also possible that the level of CUDA in 285 has been deprecated.