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Thread: Unlocking Fourth Core on Phenom II 720

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    Unlocking Fourth Core on Phenom II 720

    Hey guys ive been reading a small amount on unlocking the fourth core on a Phenom II 720 and well it got me all excited

    What do I have to do?

    How do I do it?

    Am I able to do it?

    CPU:
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  2. #2
    jim
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    Re: Unlocking Fourth Core on Phenom II 720

    From what little I know of it, there's a setting called ACC (not sure what it stands for), and if your motherboard supports it, you can enable it and it *might* give you a usable fourth core.

    There are generally three options

    1) Perfectly working fourth core
    2) Dodgy fourth core - works, but might only function at lower clocks than the other three can cope with. You have to decide whether you want Quad-Core at X GHz, or Tri-Core at less GHz
    3) Broken fourth core - you'll be sticking with three.

    There have been a lot of discussions on it in this forum, so if you do a quick search you should come up with a few more answers.

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    Re: Unlocking Fourth Core on Phenom II 720

    You motherboard has a 780G chipset which uses the SB700 southbridge. ACC (automatic clock calibration) - the technology which can unlock the fourth core of an X3 - is only included in the SB710 and SB750 southbridges.

    So with your current system, no, you can't unlock the core, no matter what settings you use! Sorry

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    Re: Unlocking Fourth Core on Phenom II 720

    Thats fine mate...I just wanted to see what the fuss was all about eh?

    Thanks for letting me know...Hey i'll make sure my next motherboard has that Southbridge.
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    Re: Unlocking Fourth Core on Phenom II 720

    Got any good recommendations?

    Motherboard has to be mATX and have SB710 or SB750 Southbridges.
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    Re: Unlocking Fourth Core on Phenom II 720

    I've tried unlocking the 4th core a few times without success. I've given up now.

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    Re: Unlocking Fourth Core on Phenom II 720

    This Asus 760G motherboard should have the SB710 southbridge:

    http://www.scan.co.uk/Products/Asus-...Board-VGA-HDCP

    http://www.ebuyer.com/product/161330


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    Re: Unlocking Fourth Core on Phenom II 720

    Quote Originally Posted by CAT-THE-FIFTH View Post
    This Asus 760G motherboard should have the SB710 southbridge:

    http://www.scan.co.uk/Products/Asus-...Board-VGA-HDCP

    http://www.ebuyer.com/product/161330
    I got that motherboard and a Phenom II 720, but can't find the ACC setting anywhere..

    But if I'm just being stupid and manage to find it then I'll let you know!

    EDIT: http://vip.asus.com/forum/view.aspx?...Language=en-us - it wasn't just me
    Last edited by MrSnaffles; 23-05-2009 at 05:55 PM.

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    Re: Unlocking Fourth Core on Phenom II 720

    The J&W 790GX Extreme has a jumper Called JHDT which has 2 settings normal or Overdrive. But, because the documentation for this board is soo poor I'm not sure what the jumper really does. Even an Email to their technical guy never got a reply as to what exactly this jumper does.

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    Re: Unlocking Fourth Core on Phenom II 720

    Well thanks for your help guys but my upgrade wont be till ages I just built my system

    Unlucky MrSnaffles and Sputnik, hope you find the settings
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    Re: Unlocking Fourth Core on Phenom II 720

    Quote Originally Posted by Mikey9980 View Post
    Got any good recommendations?

    Motherboard has to be mATX and have SB710 or SB750 Southbridges.
    DFI LanParty 790GX-M2RS Jr has got some decent reviews & has a 750 southbridge & is mATX

    http://www.scan.co.uk/Products/DFI-J...A-II-Micro-ATX

    No guarantees that it will unlock a Phenom II 720 of course.

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    Re: Unlocking Fourth Core on Phenom II 720

    oops.
    Last edited by pharm; 24-05-2009 at 03:22 PM. Reason: double post

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