with the x48 as long as u keep nb temps sane ( < 50c ) you can push all the voltage into it u want, but 1.6-1.65v and it becomes pretty frivolous since it just makes more heat and little gain. i ran 1.59v on mine air cooled for ages. I run 1.49v now cause tight Performance Level on top of highish FSB freq isn't very healthy for day to day use, generally ends up with memory errors or random software faults (ie windows search randomly couldnt find files on my system). I use PL 7 with 466MHz fsb and 1.49v vNB and 0.63x NB GTLREF and thats what mine likes at this freq.
um my vtt should be 1.38v in bios which gives an output voltage of 1.41v atthe sensor.
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