Core i3 1st gen M @ 2.5ghz vs core i3 3rd gen U @ 1.9ghz

Yes i do believe that the i3 3rd gen U will be cooler. I'm just not convinced that it will be faster than the old i3 1st gen M since it runs at 2.5ghz compared to 1.9ghz. Is speed dependent mainly on the generation or the ghz?
 

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