You can't use PC100 memory in PC133 slot even though they are physically compatible. The memory would be overclocked 33%. You can put PC133 memory in a PC100 slot because it's not being overclocked.

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Swing and a miss. The RAM does not get over clocked. The faster ram gets under clocked.

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Sorry but I've tried moving memory out of PC100 machines into PC 133 machines and they DO NOT WORK EVER in my experience.

What you say also makes no sense because if the system bus drops, so does the speed of the CPU, the drives,and everything else that depends on the bus for it's timings. Putting a PC100 stick in a 533 Digital Audio (which I have never gotten to work anyway) would lower it to a 400mhz machine if your logic follows.