Pentium 4 4.0 GHz or Core Two Duo 2.13 GHz?

The clock speed on a processer does not mean anything and can only be used to compared processesers of the SAME MODEL.
 
odd though, i have a p4 3.0ghz and a pd 3.0ghz all with similar specs and the p4 outperforms the pentD

Most likely because you were running something that can't utilize both cores. The p4 would run better because (most) games, etc.. are not written at this point in time to use both cores. Although the pd would perform better when running several applications at once.
 
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