Unlocking the multiplier would require some soldering to the chip itself most likely, I haven't read up on AMD64 multipliers though so I don't even know if or how it can be done.
I see you have an FX-57, and just for reference, there is more to overclocking a CPU than raising the multiplier. In most cases, that isn't even an option, and you have to go through the more challenging (yet fun
) process of increasing FSB speed
Overclocking the CPU will usually reduce the lifespan by a few thousand hours.