Was not this Vfsb mod shown already...?

The FSB limit seems not to change though Vfsb mod was tried.
It changes in each CPU's.

Data
P5B Deluxe
X6800 L626A
cooled by air(Temp about 14C)

FSB　　Vfsb(actual)　　Vmch(actual)
544.0　　　　1.47V　　　　1.76V
544.0　　　　1.50V　　　　1.90V
544.0　　　　1.55V　　　　1.95V
544.0　　　　1.70V　　　　1.95V