The Macbook Air looks good and its performance is the sort of thing one wants to compete with future ARMs in tablets.
Macbook Air uses the 15W Haswell processor, and puts it in the base of the unit along with plenty of fan cooling. The Y processor with much lower power cap ranges allow for placement behind the glass of the machine, which is suitable for a tablet or detachable form factor. Macbook Air is not a good example of this.
for the ARM machines the frequencies quoted for a device are normally the maximum and they can down considerably. For Intel the frequencies are the normal running frequency rather than the turbo frequency.
Intel seems to be shifting away from this approach with the Y processors. In the Y processors, they are quoting base frequencies, assuming the TDP is chosen as the steady-state power cap. However, they also give OEMs the freedom of choosing power caps lower than TDP, all the way up to a floor that they define as "SDP". While this does not affect the turbo power headroom of the chip, it does affect the frequencies at steady-state - meaning that if you run a workload that's intensive enough, and long enough (longer than the pre-defined turbo duration of 1-30 seconds), then it will eventually throttle frequencies until the power cap is reached.
That seems to be more like what the ARM products are doing.
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