The actual Multiplier is recognized by i believe the L5 and L6 bridges (look up the first AMD Athlon T-Bird article Tom wrote about OC'ing it) anyways, thats where the motherboard picks up the ACTUAL Multiplier, what you tell it later is different =) And yes, this can also be manually manipulated by closing/opening those bridges.....
What I'd love to know is how in the first place people knew to pencil in the L1 bridges to change the Multiplier....like, someone out of curiosity one day decided to just fill in the bridges and see what happens ???
My <font color=red>Z28</font color=red> can take your <font color=blue>P4</font color=blue> off the line!