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Thread: Undervolting AMD processor

  1. #1
    Join Date
    May 2008

    Undervolting AMD processor


    I would like to undervolt my current AMD processor (Phenom 9550) Have to do it with an application, as my Motherboard does not support it

    I have found a linux tool PHC

    According to their website there is an AMD patch floating around, but I havent found it.

    Does anyone have any experience with this tool and AMD??



  2. #2
    Join Date
    Jun 2007

    Re: Undervolting AMD processor

    There is the k8fq utility. It is the fastest way to set one speed/voltage. Unfortunately it's not automatic.

    I've used this on my Athlon64 before. No idea if it works on Phenoms (heard AMD redid PowerNow, breaking all the old undervolting techniques).

    There indeed is indeed a PHC patch floating around too (someone posted it on a mailing list). I never got it working. Add to that the fact that it's probably based on an old kernel and never updated, plus how it's also broken by AMDs redone Powernow...

    I suggest trying k8fq, if it doesn't work then the PHC patch won't work either. Let me know, I have a newer AMD (not the Athlon) cpu I can try things on if it doesn't.

  3. #3
    Join Date
    Dec 2006
    Ubuntu 9.04 Jaunty Jackalope

    Re: Undervolting AMD processor

    Why do you want to undervo[t the CPU?

  4. #4
    Join Date
    May 2008

    Re: Undervolting AMD processor

    Quote Originally Posted by 444 View Post
    There is the k8fq utility.
    Thx I will give it a try.....well I found the website. The latest version is from April 2007 and according to the site might be working on a Opteron. I am a bit reluctant to install
    1 might break m CPU
    2 probably wont work
    3 will break my allready working powernowd

    Quote Originally Posted by nexus_2006 View Post
    Why do you want to undervo[t the CPU?

    The CPU in my HTPC is making to much heat and doing nothing most of the time
    Last edited by Bloemetjesgordijn; May 10th, 2009 at 03:21 AM.

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