M4A79 Del as well 0921 chip
I am running Bios 1602, and although I passed 3 hours small FFTs at 3600MHz, Blend locks up the system in 3 seconds, and 3dVantage crashes after the first 2 tests. Blend runs fine with only two cores enabled.
I have tried adjusting CPU-NB and HT Link speeds up and down, adjusted voltage and right tried moving from auto acc to manual with default -2%, 0% and even +2%.
Highest I have gotten with AOD clocking the dual core was 4GHz.