I did that - I even increased them beyond their defaults and it still couldn't boot beyond 2666MHz. I've done that too and it's still unbootable. I even used XMP settings but lowered the RAM speed and that too was unbootable. I heard those who have DS (double-sided) RAM have the most problems. I'm hoping the new AGESA update addresses this. EDIT: So I checked dmidecode in Linux. It says the "speed" is 1067MHz, but it says the "Configured clock speed" is 1333Mhz. It's also reporting the wrong voltage - I set it to 1.35v but it claims its at 1.2v, including configured voltage.