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UPDATE: Phenom II X3 core unlock is real

amd_logoJust a few days back we brought word that a certain Biostar motherboard was unlocking the fourth core on a Phenom X3 720. First off, the fourth core is real. It is not a BIOS bug.

Here are the juicy bits that you need to know:

  • The chip must be a Phenom II X3 720 Black Edition.
  • It must come from batch number 0409 (Week 4 / 2009).
  • Your motherboard must have the “Advanced Clock Calibration” option. DFI, Biostar, Asus and Gigabyte boards typically have this feature.
  • This chip is sold out virtually everywhere.

It’s possible that 720s produced after batch 0409 can also do the voodoo that 0409 do, but there’s no guarantee.

In other news, TheInq is running a short op-ed on the merits of leaving this technique well alone. They say that letting enthusiasts do their thing will build a groundswell of much-needed goodwill:

The small amount of cannibalisation that occurs will be more than made up by word of mouth sales. Would you rather have one up-sell, or three new customers? Short story, let it be, and don’t ever ‘break’ the hack in a later BIOS. 99 per cent won’t ever do it, the other one per cent will be great ambassadors. All you will ‘fix’ by blocking this is their enthusiasm and pent-up good will.

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7 Comments:

  1. MiracleManS
    Mediocrity Gets You Pears

    Sweet Jesus. Were they just lying about super awesome laser cutting?

  2. Buddy J
    Dept. of Propaganda

    Dunno about lying. I don't think they ever said they laser-cut the Phenom IIs. Perhaps that only applies to 1st gen Phenoms, which I guess this trick doesn't work on.

  3. I'm supposing that the first generation were laser-cut, but that process might have been too expensive or time-consuming. There are other ways to disable the core, I guess. AMD might have gotten lazy, or this is a SUPER SECRET DELIBERATE PLOY.

  4. MiracleManS
    Mediocrity Gets You Pears

    Part of me hopes its the latter, because if it is...kudos to them.

  5. Leonardo
    F@H Reign of Terror is back!

    It's my guess that originally, there probably were many quad-core dies that were not quad capable, resulting in faulty cores on those dies being disabled. Later (again, my conjecture) on when the production process improved, AMD decided to bin some of the quad-cores to triple in order to keep quad prices higher - better profit through filling market niches. It wouldn't surprise that the newer tri-cores that can be unlocked were non-defective quads before being binned as X3s.

  6. AlexDeGruven
    I am Geek. Hear me... type?

    They also could have binned a bunch of x4s as x3s to fulfill standing orders for x3s. Since x3 were only x4 with one disabled core, they could have disabled it for any reason.

    I love the fact that this exists. And if it was intentional, it's a fantastic nod to the enthusiast crowd (ala Vista Ultimate upgrade used for full install).

    It's my guess that originally, there probably were many quad-core dies that were not quad capable, resulting in faulty cores on those dies being disabled. Later (again, my conjecture) on when the production process improved, AMD decided to bin some of the quad-cores to triple in order to keep quad prices higher - better profit through filling market niches. It wouldn't surprise that the newer tri-cores that can be unlocked were non-defective quads before being binned as X3s.
  7. TheLostSwede
    Where's the ****ing beers?

    Theese Gigabyte boards do infact unlock the last core: (with a beta bios)

    MA790FXT-UD5P, MA790XT-UD4P, MA790GP-UD4H, MA790X-UD4, MA790FX-UD5P, MA790X-UD4P, MA770-UD3P, MA770-UD3 (rev 2.0), MA770-US3 (rev 2.0)

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