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.
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