There is tons of generic RAM that will run at 133. R U gonna run at 133 or 100. If it is 100 the you shouldn't have any problem. If it is at 133 then you should see if the PC-100 will run at 133 by itself. If it does then add the 133 and you're off.
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Overclocking is like supercharging. It's not necessary, but it sure is fun to have the fastest in town!!