Thanks for that info, maestro. I still have yet to try setting the CPUs to a lower clock speed. I can go as low as 913 or so MHz before there's no point in having changed the bus speed. Naturally, if none of that works, I'll be back to a 133MHz bus. What'll be interesting is trying to overclock the CPUs with the 133MHz bus speed and seeing if similar problems pop up.
DP 1.08GHz PMG4 MDD, 1GB PC2700 DDR, 200GB ATA (16MB, 7200RPM), Radeon 9800 Pro (256MB)