Hi,

The only thing that was really going for P4 is that it can be clocked extremely 
fast.  But the fast clock cycle led to an extremely long pipeline (over 30 
stages!).  HyperThreading (the technique that simulates two threads running at 
once) is really only useful in certain situations.  

Core 2 duo went back to a P3 design (i think), added some current features, and 
put two cores on a single chip. This architecture is better than P4 by far and 
is more efficient, which is why you are seeing a high performance degregation 
when compared to the Core2 duo.   

I'm taking an advanced computer architecture course this term and we went over 
these two architectures.  

Cheers,
Nick

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