We can therefore expect the PowerVR to manage 25 Mh/S at .9w. This gives us a Mh/J of 27.7, compared to 1.8 for a 5850.
This has potential.
Color me impressed, I don't believe it will either give out that hash power or use that little power. How could they provide a chip that is more than ten times for efficient than high-end desktop versions, for a device needing less complexity than a desktop PC.
Thats exactly it. They are much less complex, which means smaller chips, which means less power consumption. Mining is a very simple operation, most of the stuff on a desktop chip (high speed RAM, ROP's, Texture Units) is extraneous and wastes power.
But I agree, hard numbers are needed. I will try and get a dev board so I can test it.