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If a PC100 machine won't recognize PC133 DIMMs then the problem is something other than the speed. Dig a little deeper into the specifications. I had an experience like that with a PC66 machine-but it turned out that it was designed for '2-clock line' DIMMs and all the new DIMMs (including newer PC66 ones) are '4-clock line' DIMMs. I don't know what the clock lines are, but that was the problem, not the speed.

By the way, you have your last statement backwards. Higher RAM speeds will run in sockets with lower RAM speed specifications.