I am struggling with that too. And i have an older card (9600GT) It's not even Fermi based. It's Tesla based. But still sucks. Did try almost everything i could. Changed Performance States Clock settings lately. No difference. The card is all the time in the same clock setting, yet it still crashes all the time. I think the problem is in the Mac Nvidia drivers.. As i remember i had no crashes until 10.8.4-or 10.8.5 So i was about to try that older drivers with 10.9. But they renamed some kexts!! Nv50Hal to Nv50TeslaHal. So i don't think it could work. Anyway i am going to try perhaps 10.7 and 10.8 to be sure about that they work or not. This is how i test my machine: Open Safari, browse here :?http://ink361.com/app/tag/video Open some tabs with videos, try to play them. Sometimes i can play 5 videos without crashing. Sometimes on the first one the UI crashes already.. Sooner or later it crashes. It would be not a big problem because i don't watch these videos normally. And by the way Chrome or any other browser than Safari won't crash on there. But i had crashes when i was drag and dropping files on the desktop! Something which i cannot replicate easily, but it is freaking annoying. I am thinking about buying a Kepler based GT630 video card now. GK208 is its core. So latest second generation Kepler. I have been searching for it. Someone was telling it only crashes after wake from sleep. Which i don't care, because i don't use sleep mode. I still have a feeling that card would suck for me too.. ? I would love to buy a cheap Ati card if it could work with OSX. But they all suck as i am reading. The cheaper ones. R7 240 would be nice. It is amazing how badly Nvidia cards suck under OSX with Channel Exceptions. Frustrating.