i only have a p4pe so my fsb is only 170 but it could be a couple of things.
are you using your memory my spd or have you enterd them manualy ? some times by spd gives the wrong settings.
have you tried lowering your memory divider to see if you can push the cpu higher ? most test's i have read showed lower memory speeds running it faster timings gave better results on the 865 and 875 chipssets unlike the older ones like i have.
apart from that it could be you have just reached the limit.
dont go any higher than 1.7v for long period of time.
3.9 is still nice.
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