AMD X2 (939) CPU throttling

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3 Nov 2004
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662
Location
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I've just reupgraded one of my rigs again from a single core 939 3200+ to a dual core 3800+.
Everything going fine this time, nice temps due to inclusion of a water cooler now. Now, not sure if its the same problem as the stuttering with games I read about digging in the forums, but when I run boinc, it decides every minute or so to throttle down to 20% for about 15 secs, then back up.
Have installed sp3, amd drivers, hotfix, optimiser, regedit, as suggested, but this still happens. This doesn't seem to be a problem if I put boinc on snooze and run games for an hour or two, never notice a throttling. so it seems boinc specific. any ideas?
 
well,cool n quiet is off in bios,
windows xp sp3 is what i am running,
both processors are active in task manager
am controlling cpu voltage and behaviour mostly via rmclock.
if via boinc i set processor usage to about 75%- 77.5%, this seems to keep the throttling from happening.
 
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