Intel is on about the same ballpark as the big arm tablet chips but they can't shrink it any further. They got this low simply from node shrinks, but at this point making a new core design only for the tablet market would require very high sale volumes. And they failed to infiltrate the tablet market so...They even canceled their atom line, only the premium Core M for products like the 12' apple macbook, which don't seem to gather much traction either.