And the question remains...
Dude, I've got pretty much the same question/problem you do — dual 1GHz QS, resurrected for $5 with a 533 MHz CPU from a DA machine and it works quite well! Booting from a Firewire drive it even runs Leopard smoothly, if a *little* slowly. It's tantalizing to realize how close it is to a full recovery.
But I'm as broke as you are and the only dual 1GHz processors I can find are MDDs and *way* out of my price range. Alas, spending $100 on computers is a crazy dream for me. Besides, anybody can throw money at a technical problem, but we got "obsolete" computers to fix, mod and overclock!
So the question remains: to what extent are G4 processors interchangeable? Obviously they don't have to come from the same model. Bus speed seems to be a consideration but how crucial is it? Since the underlying architecture is as good as QS ever got, and it can obviously handle the speed, what would prevent the transplant?
That's the question. Did you ever find out the answer, at least in this specific case? Does anyone else know?
PS — I live in Washington state, too. Thanks for the info re recycling laws; it helps explain why free computers are so scarce.