Also, early hyperthreading technologies didn't really do much (some people will even say it hurt performance a little).
But yeah, there is a lot more to a processor than just clock speed. Deans right on the money, so a core 2 duo at 1.7GHz will feel faster than your 3.4GHz P4, but it would be incorrect to say they are equivalent or "faster" or "slower" or whatever.
Its hard to difficult clock speeds of different families of processors. Perhaps you all remember the old Apple ads comparing their 400mhz G4 to a 1GHz Pentium 2? And even though the Core 2 duo and the Pentium 4 are both from Intel, their architecture is quite different and therefore comparing clock speeds is just plain weird.
Brian, you would definitely benefit going to a new dual core processor (and the associated new motherboard w/ faster bus speeds and whatnot).
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