Swapped 1066mhz RAM back in (was running 1333mhz) and running 3ghz completely stable so far. Took GPU memory back to 1050mhz and got 79xx in 3DMark 06. Looks like my issues were memory related before.
hmm. I have 1333 ram as well. I wonder if that's my issue as well. Do you all ever use ntune to overclock your cpu in addition to your gpu? Seems like a good all-in-one solution.