Originally posted by dima_s
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This does not mean you will use negative adjustments, but if the situation called for it, you would at least be able to do so. Some people are not able to achieve the correct adjustment due to lack of negative adjustment capability. It varies for each board.
In my case, I give my lanes 1 & 2 +90mv and lanes 3 & 4 +80mv. This allows me to run 1600fsb at 1.2v VTT instead of 1.3v VTT if I left the lanes on auto.
There are many good guides to GTL Ref settings out there. I recommend going to forums related to your board for specifics.
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