i pulled the sink off, everything looked to be contacting ok, replaced the rubbery pad (easy to peal off!) with arcticsilver ceramic.. temps down maybe 5-10c. but not a great deal. still hitting 70c at 1.45v/3433mhz..
i think i just have a poorly calibrated diode.
motherboard seems to have little to no issue with high fsb for x2's, running 286 atm without touching voltages, ht link at 1143. when i get round to it ill test max-posting fsb with 5x multi.
***EDIT***
i got 300 fsb no problem but 333 always hung/auto reboot and gave the error "The CPU Frequency has been over running" - this was with all stock voltages and 3x ht multi and 5x cpu. so id say 11x is the lowest multi for use for trying to hit 3300mhz+ on an x2 for my board. your milage may vary, and i didnt explore settings for long
***END***
as a side note, the ax78 is applying the selected multplier at powerup unlike the AX8 (939/via 890) which started on default multi then dropped it. so im not used to running fsb much over 250
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