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Higher performance engines are more and more sensitive to heat, and thus requires better and and more capable and consistent cooling. Energy is energy, and heat is heat. Energy in is energy out. Very basic and super simple stuff really. Just like calories in and calories spent. Spend less calories than you consume and you grow bigger consistently, and vice versa.
Hopefully the other analogies hold up better that the calorie one, heh. Because 1000 calories of broccoli doesn't equal 1000 calories of Twinkie. The body isn't nearly that simple of a system. I don't know about CPUs.
But, I think you made a good point (maybe?) that the A-chips are doing Intel-matching performance in bursts, not on the whole? But, is that a matter of cooling? And, are they using a lot more than, say 1 watt (or whatever iOS devices draw) for that short time-period?