sorry to keep you waiting so long. I went with the abit mobo and got rid of the matsonic. And to anwser your question all I had to do was enter the bios and change the FSB to 75. I don't know why you are having probs with it, I have a 466 so my multiplier is at 7, maybe yours is higher so you don't have as much head room. Sorry if this doesn't help ya, I am pretty new to O,C,ing so i am still learning.