Every driver I have tested, I tried with both my regular settings (CPU OCd to 4.2) GPU stock, and running stock CPU + GPU settings too. I have also tried with only 1 card in at a time to make sure its just not a matter of SLI trouble. I had a crash in 306.97 just now.
Also it is not a matter of system being under too much weight. Able to play Crysis 3 and BF3 on Ultra just fine. My temps are not getting above 60c. This entire issue everybody is facing is not a heat issue, otherwise it would not be so far widespread. Its a driver + SC2 inconsistency. Unless somebody comes up with a temporary solution, our best bet is to wait for Nvidia to fix things, which is likely to be soon since they have acknowledged the problem. :)