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WTF is ACC?

Discussion in 'General Hardware' started by TheMailMan78, Jul 1, 2009.

  1. TheMailMan78

    TheMailMan78 Big Member

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    I've googled and looked around here and I cant seem to find a clear answer as to what ACC "Advanced Clock Calibration" is. Currently it is turned off in my BIOS but I would like a clear explanation of what it is and how it could effect my OC.
     
  2. DanishDevil

    DanishDevil

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  3. Nick89

    Nick89

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    I think it changes the clocks between each core... not sure, and that article is a year old.

    I read the article and it was not very helpful.
     
    Last edited: Jul 1, 2009
  4. TheMailMan78

    TheMailMan78 Big Member

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  5. DanishDevil

    DanishDevil

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  6. TheMailMan78

    TheMailMan78 Big Member

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    Finally a clear answer. Basically not having ACC turned on in the "+" I have been hampering my OC. No wonder I couldn't get past 3.45 @1.44v

    [​IMG]
     
  7. DanishDevil

    DanishDevil

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    Yep, article says that even though AMD is hesitant to say it, they kinda hinted that you could get another 200MHz out of your CPU with it, or undervolt better.
     
  8. TheMailMan78

    TheMailMan78 Big Member

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    Here I was thinking I have another bum CPU and all it was is a BIOS setting. :nutkick:
     
  9. DanishDevil

    DanishDevil

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    Yup. BIOS settings are about as tricky as women sometimes ;)

    Have fun clocking! :rockout:
     
  10. 1Kurgan1

    1Kurgan1 The Knife in your Back

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    ACC is for Phenom I's, Phenom II's have ACC built in, the only good ACC will do for a PII is trying to bug out a tri core or a dual core into turning into a quad.
     
  11. Nick89

    Nick89

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    what does ACC even do? in my bios there are options for +2% to +12% and the same in negative... what does this do?
     
  12. Mussels

    Mussels Moderprator Staff Member

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    that matches what i heard.

    Its yet another F'ing setting to remember when OCing :toast:
     
  13. johnnyfiive

    johnnyfiive

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    Yep, make sure ACC is OFF when your working with Phenom II's. It has no positive effect on Phenom II's, it may actually hinder your max OC if its on with a Phenom II.
     
  14. erocker

    erocker Super Moderator Staff Member

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    Really? I thought ACC still works with PII. In MailMan's case it may actually be beneficial since he seems to be suffering from a core that doesn't want to clock as high as the others. ACC is basically the ability to raise or lower the voltage to a particular core up to .4 volts. Using ACC to add voltage to the bad core should help with a bigger and a more stable overclock.
     
  15. erocker

    erocker Super Moderator Staff Member

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    I should correct myself as it seems it's a bit more complex than that. I have however seen several people with X4 955's that claim setting it to +2 for all core gives them about 200mhz more overclock. I'm going to test this on my x3 720 now.
     
  16. Evo85

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