@ Megadethlore: You can change the multiplier on the Xeons, but down only, i.e. on my E5430's, which is normally 8, I can go down 7.5, 7, 6.5 and 6.

Which is good

But yes, you're probably referring to the multiplier being capable of changing upwards on the normal Xeons, - this would be failry impossible, as Intel disables this feature internally in the chip, via hardware-fuses they burn.

Think back in the old days with the Athlon XP's, where they had "bridges" exposed to the top of the cpu casing - you could easily mod those "binary" fuses to give different clock multipliers - Intel's is fairly similar, but internal, and therefore, unaccessable.

I very much doubt you could change it via any hardware pins though, VID yes, but most likely not FID.....