Hack #28. Unlock Your CPU Multiplier

Overclocked AMD processors benefit from this down-and-dirty hardware hack that allows you to change the CPU multiplier value.

The objective of this hack is to release the electronic "lock" that prevents you from changing an AMD CPU's clock multiplier value. This is done by connecting circuits on the top of the CPU chip itself. From the steps below, which identify whether or not the two circuits of interest are connected, you will know if your multiplier needs to be unlocked. Unlocking the multiplier involves some very serious, precision work on the CPU chip itself and is not for the faint-hearted, caffeine-addicted, easily excitable types. In other words, patience, steady hands, good eyes, and controlled breathing are desirable assets. This technique is also described for many (but not all) AMD Athlon CPUs at various hacking/overclocking and gaming enthusiasts' web sites like http://www.tomshardware.com, http://www.sysopt.com, and http://www.tweaktown.com.

You will need the following tools to execute this hack:

  • An antistatic work mat or foam pad

  • An antistatic wrist strap and grounding point

  • A magnifying lens

  • A #2 pencil or 0.5 mm mechanical pencil with HB2 lead

  • Optionally, an automotive window defogger repair kit (silver paint)

  • Optionally, a soldering iron with a miniature tip, and solder (I recommend eutectic or SN63/37 blend solder for better connections)

  • Optionally, the XP Unlocking Kit from http://www.highspeedpc.com

You'll be working with the CPU ...

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