My header setup can oc to 4.3 GHz no problem with just changing the multiplier. If I bump it to x44 machine will boot after bios, nothing helps even if I throw it +1,4 volts. If Realtime ratio changes in os is enabled boot after bios also happens. Am I doing something wrong when not accessing to windows or just unlucky with the cpu?
This would be better posted in the section labelled for Overclocking instead of here.
That being said, a lot matters that you haven't mentioned.
What CPU cooler do you have?
Have you made any changes to the RAM configuration?
Is anything hitting the voltage regulators with airflow?
What I would do is repost the same question in the OCing forum and give an answer to those questions in the thread as well.
You can message me a link to the thread there and I can continue assisting with this issue from there, but the people that frequent that part of the forum will be able to do a lot better than I.
Thanx for the reply. I solved the issue pretty quick, the problems were due to bios F6. I downgraded to F5 and got pass x43 without booting. Prolimatech Megahalems for cooling, havent made any serious cpu overclocking yet.