Yes the higher you set the multiplier the higher the Vref you will get. To start with, set them both to 0.635x and work from there. I have found with both my dual cores they like the address bus GTL Ref (the second GTL Ref on your board) to be a little higher than the data bus GTL Ref, so you could set 0.635x and 0.655x for example. Test for general stability gains at several setting, and find the most stable setup for the given FSB & vFSB. I'm now running on my M2F 1.25 vFSB and the equivalent of about 0.690x and 0.70x on your board, it helped to stabilize my current clock.
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Mikey, I have to agree with you about fine tuning with IBT, it's quite effective. The times & GFlops are very close and consistent when tuned correctly. I have noticed that the first iteration is always a little lower & takes longer though, this is not due to speedstep delay I have that disabled. This run isnt perfect but its pretty close:
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