Anandtech.com points out how Intel doesn't release information about the limitations of the boost - primarily that it's very much a single core clock boost, and it's unknown what speeds the multiple cores can increase to. Perhaps on desktop, they can all hit 4.2Ghz, while the mobile chip is limiting them to 3.8Ghz. Of course, those are made up numbers and wild speculation. Until we have comparable benchmarks, the boost speed itself doesn't mean much to us.
