I have seen also some advices that recommends to keep loadline calibration disabled to let the vcore droop under load, mostly for 45nm cpus. The mod, in some way, will affect the mb and the cpu as it changes theirs specifications.
Try to rise a bit the nb voltage, it may help to reduce the vcore a little.
Same happened here with fsb higher than 1600. Now with vtt at auto, nb at 1,31v and giving +0.02v to the ram that issue seems to disappear up to 1700fsb but canīt confirm yet because still testing.
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