I'm not an engineer, but I know that more watts equals more heat, and more heat requires more fan activity, and more fan activity means more noise. Weren't you concerned about heat and noise?
That said, my i7 X201t is more comfortable to use in my lap than the core 2 duo X61t it replaced, and the fan runs less often and is quieter. This could simply be the design of the cooling system, or it could be that the i series uses power more intelligently (since it dynamically adjusts the clock rate and number of threads according to use).
The i5 also comes in an ultra-low-power mobility version, and the X201s was at one time available with this configuration; if it still exists, it would be a good option for anyone looking to maximize battery life and minimize heat and noise. However, the UM versions are said to lag noticeably in performance in practice.
David
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