How to set up GTL Ref Values for 45nm & 65nm

[-n7-]

You have tried the basics, but if it errors out in large FFT's at even 7 x 450 I'd be leaning towards a ram/northbridge related problem. You are running 4 x 2GB sticks, you may need 1.4v+ on the NB to get that stable at 450 FSB. Try increasing vNB to 1.4 - 1.45v and see if there is an improvement. Leave the multi low for the test to eliminate the CPU. Once you get 450 FSB stable, you can work the cpu back up to the desired speed.

To properly find the max stable cpu clock you should pull 2 sticks and just run 4GB till you have that sorted.

2x2 GB RAM set all very loose to ensure its out of the equation

Thought of that before i even put the chip in.

Yesterday i basically went from 1.2 vtt to 1.4 vtt trying pretty much all the GTL values (0.6 to 0.75 basically) for each vtt voltage increment.

I eventually just gave upon the finesse approach as no combination was working.

1.42 vtt with auto GTLs seems stable @ 450, but even going to 1.44 does not gain anything; maybe 452 at most; more testing needed.

Seems this board really hates anything over 450, at least for stability.

I can boot way higher, but anything over 450 won't pass IBT or P95 Blend/Large.