Vcore mods for A7V8X-X???

Does anyone know of any Vcore mods for the ASUS A7V8X-X? I have a multi-locked 2400+ (AIXIB 0346) maxed out at 1.85v (153 X 15). I have some more cooling power left and I want to up the fsb some more. So I figure the only way to do that with a 15X multiplier is to up the Vcore.

If anyone knows how to get more FSB out of this mobo/chip please let me know.