As a general rule, 5W TDP is the target for a fanless tablet. Of course 6 or 7 or 8W can be made fanless as well depending on the cooling but this would be on the high side and increases the manufacturing costs for better cooling. There is a good reason why Bay Trail-T is around 4W TDP. Haswell-Y with 6W SDP has a 11.5W TDP in nominal mode and 9.5W in TDP-down/LFM mode. For a tablet this is still a very high power consumption. What TDP has a 4.5W SDP Haswell-Y? There are rumours that Broadwell-Y comes with a 5W SKU which I hope it refers to TDP. Such a SKU would be the first proper tablet capable Core based SKU.
Re: Haswell-Y isn't really suitable for a tablet imho
The Macbook Air looks good and its performance is the sort of thing one wants to compete with future ARMs in tablets. As to frequency - 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. Since benchmarks very often boost to the turbo this makes comparison on the basis of frequencies a bit difficult. The ARM devices can normally go faster and there was a bit of a stink recently about Samsung putting in a turbo mode for some tests, the problem is that turbo mode uses a lot of power.
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