Go here: http://www.extremetech.com/computin...ressing-mediocre-picture-for-intels-broadwell It should be noted, which the article above fails to mention, that Core M is an Intel Broadwell Y chip. Intel Broadwell U chips are coming early next year, and may be an improvement. And the following generation Intel Skylake chips are coming in second quarter of 2015. But, in any event, the article underscores the problem with finding a readily available microprocessor that can at the same time maintain current ultrabook task processing speeds, drive a retina screen, and create a super slim design through the elimination of a device cooling fan without significantly sacrificing battery life. Hence, the lack of a marketable MacBook Air Retina to-date other than in theory and in planning. Depressing.