You said the models without the -U are incompatible with the B&W G3 and your model doesn't have the -U so you cannot use it?

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My model has no M in it so I have no clue if the statement in the manual still applies or not.

We can very quickly come to a full conclusion once I figure out the correct jumper sequence. If it doesn't work, well then we know for sure.

I'm reading off this page and right now I'm jumpered 00011101100 which is 4.5x, 100mhz, which makes sense as I had a 450mhz CPU in before. I can drop the bus down to 66mhz if I want but the multiplier tables change and I'm unsure how Sonnet managed to achieve the 1ghz speed on either bus speed unless it had an onboard multiplier?? :?:

If that's the case, It totally screams that there might be a resistor that determined what bus the upgrade was designed for. From the installation photos the beige and blue and white adapters look identical.