Unlocking AMD CPU Cores Safe Say Mobo Makers

While browsing through motherboards at Computex, several manufacturers were quick to tell us some details about the recently released dual-core Phenom II CPUs from AMD.

Two motherboard makers told us at the show that AMD's new processors are safe when unlocking disabled cores. In fact, one motherboard maker even told us that when you unlock the disabled cores, they run at slower frequencies than the normal cores.

This is of course all incorrect, and it is indeed not a safe guarantee when you unlock the disabled cores. The reason for this is that the disabled cores are turned off for a reason: they failed factory tests. Cores can fail for any number of reasons, including defects in the silicon, problems running at full frequency, or a bug introduced during manufacturing.

Both AMD and Intel disable CPU cores for this very reason.

When you unlock the disabled cores, they will run at full processor frequency, since you cannot run each core at different speeds. While you may see initial gains and benefits from turning a dual-core CPU into a quad-core CPU, you may introduce instability into your system. Things may corrupt, calculate incorrectly or even crash.

Despite what we were told, we still recommend that if you're going to unlock disabled cores, do so with caution in mind--there is always a risk that something will go wrong.

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  • tweak13
    Wait what, I had no idea there were disabled (extra) cores in cpu's.
    -11
  • hunter315
    All of the Phenom II's are identical designs, the best ones end up as 955s and the defective ones end up as 8xx X4s, 7xx X3s, and 5xx X2s. So you only have disabled cores if you bought a phenom. I dont know which Intels have disabled cores.
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  • tweak13
    hunter315All of the Phenom II's are identical designs, the best ones end up as 955s and the defective ones end up as 8xx X4s, 7xx X3s, and 5xx X2s. So you only have disabled cores if you bought a phenom. I dont know which Intels have disabled cores.


    very interesting, thanks.
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