No problem whatsoever. I even put PC133 on old 66MHz bus Celeron systems. Memory rating is a maximum speed the company can garunty, there is no minimum speed (what's in memory will stay in memory until the power is disconnected).
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I agree. As a matter of fact, I have begun the practice of putting PC3200 on boards that only require PC2100, as PC3200 has dropped in price, and some people purchase the ram in anticipation of their next mobo purchase...
But to answer your question...there should be no problems whatsoever. The memory will just "underclock" and run just fine.
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