Quote Originally Posted by nemrod View Post
I don't think it's independent, (related to multi of the same frequency)
Then, in order to lock the pll of the cpu, there is probably a sequence starting in the "catch" (not sure of the english term) of the cpu's pll and going at a certain speed up to the fsb value.
Two things; #1 I'm pretty sure it'd work since the PLL shouldn't NEED to lock, but you'd need to hold the frequency stable wherever you are generating it.. and #2 I'm not so sure there's really a PLL at all, and the CPU isn't just being fed a multiplied value from a crystal on the board. Example; the CPU clock generator frequency on my AM2 board isn't that stable; it drifts by ~+/-3 MHz. That's pretty substantial. Something more robust might be in place on a high end server board like this, but who knows.

Here's another idea; to maintain synchronization why not build a simple circuit to multiply the system crystal frequency up to the desired speed and feed that to the CPU, set multiplier and you should be good to go.