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X2 to X4?

Athlon X2 7750 BE: Unlock all four cores

Recently several reports were published according to which it is possible to unlock the fourth core of AMD's triple-core Athlons. No it seems like it is even possible to transform the Athlon X2 7750 BE into a quad-core CPU.
Athlon X2 7750 with four cores?
Athlon X2 7750 with four cores? [Source: view picture gallery]
A screenshot that shows an Athlon X2 7750 BE with four active cores has been published. The older (still 65 nanometers) Kuma core CPU seems to be a quad-core (Barcelona) that had two cores cut off by AMD; possibly because of quality assurance reasons. According to the screenshot at GPU-Z recognizes the Athlon X2 7750 BE as an Phenom FX 7750 BE with four cores.

So it seems like the procedure that was successfully tested with newer triple-core Phenoms works in this case, too - it is only necessary to activate ACC in the BIOS. In theory nothing speaks against this procedure, but AMD surly has a reason to deactivate the cores - so there will probably be only a few processors that work correctly with all four cores activated.

Author: Mario Riemann (Apr 27, 2009)

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Comments (7)

Comments 4 to 7  Read all comments here!
Pedro David I did :D
Junior Member
10.11.2009 14:29
heres mine and unlock
ACC= PER CORE -2-2-4-4
ecs a780gm-a ultra
unlike the korean one it sais AMD ENGINEERING SAMPLE (ES)
and CPU-z gives me an error when trying to validate. (via auto or manual)
the 2 new cores 100% functional.
just did it today.!!!!
Ar.Pi Re: Athlon X2 7750 BE: Unlock all four cores
Senior Member
27.05.2009 04:09
Where is the spam bot!
Ar.Pi Re: Athlon X2 7750 BE: Unlock all four cores
Senior Member
25.05.2009 01:15
From what i know, odd number of cores isn't anything new. And its not always cuz of the TLB error. During fab some cores always go haywire (or not performing on par with the other cores or some other problem) and manufacturer than "recycle" them and release them, in current example, 3 cores.

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