I've got a copy of the Sun FE's manuals here, and in my reading of them, I
don't think you can put two (or more) CPUs of different clock rates on the
same Mbus; the Mbus clock is taken as a division of the CPU clock, with a
maximum of 40 or 50 MHz, and two different CPU clocks are going to result
in incompatible Mbus clocks...

	Erik <fair@clock.org>