To the best of our knowledge, it's on the die itself, or at least inside the final processore core. Nobody's been able to crack it yet. Why bother, though, since they overclock so beautifully with FSB manipulation.
To answer your question, the Intel chip does not send the multiplier to the chipset. Intel uses internal fusable links, which are 'blown' at the factory, to set the multiplier.
I can't count how many times the Intel multiplier question has been asked. I can get really sick of it, especially when people don't believe me when I say you can't get around it.
I've studied pics of P!!!'s that are online and also my own C!!. I am pretty sure that Intel uses simple micro-bridges on the FC-PGA, just like the Durons/Thunderbirds. If only I had a high-intensity laser to slice and dice the bridges for a test.
I seriuosly dought that Intel will go to the trouble of Locking the FSB. What do they have to gain ?? the reason they locked the multiplier was to stop remarkers ripping the public off. When it comes right down to it the Athlon is locked too just not as cleverly done( this maybe to allow its users a way to do it and relieve them of the warranty in the process) But still it has to be physically modified to unlock the multiplier so I call that locked. The true unlocked processors were the days when you change the jumpers on the M/B and Bam the overclock was done. If you ask me the FSB overclock has more bennies anyway's as in more banwidth.
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