It could be cpu fsb wall, try higher CPU PLL Voltage = 1.8V. If you get higher with that than with 1.5V then it's the cpu which can't do more fsb. 1.4-1.5vNB works best for me aswell.
Temps from bios with 1.3vNB and 1.65vSB:
NB = 55*C
SB = 49*C
The TODO-list is all checked. 0101-bios fixed the problem with low fsb when using 12x and 13x multipliers however the issue with core 1+2 working at 6x multiplier came back just as stated previously in this thread. I had no issues using 4x dimms at 500mhz 5-5-5-15 with 400mhz fsb and overclocking with 8x gives the same fsb as with 10x, which means that maximum stable fsb was 410.





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