I have a PowerLogix 1.1 ghz processor that's in a B&W G3. It ignored the motherboard jumper settings as far as processor speed went. I never did try changing the bus speed though. Last time I fiddled with it was a couple of years back but I believe the default speed was 650mhz. I had a problem finding a version of CPU director that would work with the two OSes on it.

When CPU director wasn't functioning it went to the default speed. By non-functioning, I mean I was able to change settings but they actually did nothing.

I also had a problem with an extension conflict in OS9. Try using extension manager to turn off all unnecessary extensions and see what happens.

For OSX make sure that version is compatible with that exact version of OSX. It seemed that every time they updated 10.4, I had to download a new version of CPU director.

My B&W is currently in storage across town but I could likely pick it up next week