[dTal]

I don't really understand this comment. You seem to be measuring CPU performance in watts. It's not a lightbulb - you can't directly infer anything about performance from power draw (otherwise the Pentium 4 would still be a top performer today). That's kinda the entire point of what they're saying - they think they can beat Intel efficiency.

What's more, performance in laptops is limited largely by thermal dissipation these days (Macbooks are outliers due to metal unibody construction). This means that any efficiency gain is also a performance multiplier. 3 times as efficient means for times as many cores for a given thermal envelope.

You would absolutely have a use for a 5 watt CPU, if it performed like a 15 watt CPU.