If you give the i5 it's full voltage and crank up the clock speed it'll totally beat an Apple chip. But in order to fit in a Macbook Air's power envelope you n

If you give the i5 it's full voltage and crank up the clock speed it'll totally beat an Apple chip. But in order to fit in a Macbook Air's power envelope you need to really throttle things back and a chip that's designed to operate in that regime has a big advantage over a chip that isn't.