Generally, AMD processors are slower then comparable Intel procesors, despite being clocked higher. A friends intel i7 is clocked at 3.2GHz, my AMD phenom is clocked at 3.4GHz. Both are quad cores, yet his CPU outperforms mine. Why is that?
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Because clock speed has very little to do with it - My 6+ year old (I think it is 6 now!) P4 3.0ghz wouldn't remotely stand up to a Core I3 rated at 2Ghz, it would probably be 4-6x slower on raw number crunching, and due to other improvements/sub routines built in, other tasks will also most likely be slower.
AMD machines may have less performance, but, they also cost less - so - it is all swings and roundabouts!
For true comparison, I recommend looking here.