Any idea what ACC(advanced clock calibration) do to Phenom II x4?

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I don't think that was what it was "intended" for. It's just something that it does. I believe it has another purpose.

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enlighten us then

thanks for the replies guys...well,i had it on auto while oc'ing,cant reach 3.795Ghz stable...but now with it off,i can do prime95 stable...im gonna try +2%(i get no boot with 4% on all cores)...acc is a secret of AMD

amd haven't told us everything about the acc yet but it main purpose was to help stabilize cores, it allows you to individually control the voltages to individual cores hence when you go under the acc option in your bios and set it to manual you will see core0 - +/-2, core1- +/-2, etc so say you ran occt and it says error on core 3 potentially you could go into occt and put +2/4/6(and so on) on that core and hopefully stabilize the one core.
this is also the reason why it unlocks some peoples dual or tri cores since your putting it on auto its putting the extra voltage too it to make it functional

hopefully you all understand it a bit better now threw my gibberish.

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if your getting errors on random cores that would indicate you should be upping the actually cpu voltage for all the cores but as you just said it does allow for negative as well so say you had one good core that never failed in multiple prime runs you could potentially increase the voltage for all the cores but turn down the one good core so it doesn't take as much stress. like i said acc is actually quite handy but as demonstrated so far in this thread most people see it as being an unlocker of cores.