AMD's 5 Watt CPU Wants to Be In Your Next Windows Tablet

Engadget has a brief news item that says AMD has a 5 watt version of their Fusion APU (that's a CPU plus a GPU for those of you who haven't been paying attention lately) designed for x86 tablets. Meaning, tablets and slates running Windows. With Microsoft's move to port Windows to ARM, is AMD too late? I don't think so - there's a pressing need for low-power hardware to run Windows in a variety of form factors, and x86 compatibility it still critical for application use. What I haven't seen anyone do yet is do a power consumption comparison between AMD's new low-power APUs and the comparable offering from Intel in the form of an Atom CPU and an Intel HD GPU. I'd guess AMD would win that, but I'd like to know for sure. Anyone seen anything like that yet?