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.
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DP 1.08GHz PMG4 MDD, 1GB PC2700 DDR, 200GB ATA (16MB, 7200RPM), Radeon 9800 Pro (256MB)