You don't - it's an Intel. Intel multipliers are internally locked in the cpu.
Actually it may be possible with extensive knowledge of the product and interaction with the mobo, but the commonly accepted way of doing it is to up the FSB.
Chances are you'll need to decrease the RD-RAM rate to support higher FSBs to 3x or something. Try and find one of stonerboy's posts - I think he's done it.
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