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

[WhiteFireDragon]

how do i set GTL for a 65nm dual core? when i stress test both core 0 and 1, it consistently fails on core 1 first. in my M2F bios, it shows the following equation for GTL:

core-0: vtt x .635 + item
core-1: vtt x .667 + item

what i don't understand is that since it's a 65nm chip, then shouldn't i change the "Y" value for core-0 to match the .667? in my case, why is core-1 less stable? then do i need to change my core-0 or core-1? my vtt is at 1.37v, so i should set the "Y" value of core-0 should be about +43mV correct?