currently running the bulldozer AMD-FX6100 3.3 on the GA-990FXA-UD3 ( rev 1.0 ) was playing shogun total war last night for around an hour, hour and a half, no issue, was playing dead island earlier.
I'm running F6f but I did update from F1 to F2 to F3 and so on rather than jumping direct to F6f and reset my bios by removing the battery once they where all installed.
Have you overclocked your CPU, what temps is it running at?