TJ Hooker said:
Your overclock isn't stable, either up the voltage (if it's not too high, maybe 1.35 or so max), while keeping an eye on temps, or reduce overclock. 4.9 GHz is really good anyway.
I skeptically bumped it up to 1.264V and it still doesn't work.
However, the error code I got was CRITICAL_PROCESS_DIED.
Does your advice remain the same?