If you have a barton, it's a 166MHz cpu. So you at least have to cut the brigde defaulting 133MHz. But it depends on what nb rev U 've got. C1 doesn't need the mod, A2,3 do need it. Maybe there is a way to do the pin mod under the cpu too in order to getting the mod (with warranty) done.

But I read somewhere (it's been a while ago) the rga has it limits around 220MHz