As mentioned before the maximum turbo clock of the Intel Core i7-4650U CPU is 3.3 GHz, which is also advertised by Apple. The i7-4650U processor shows a similar behavior: The maximum clock was 2.9 GHz for the single thread benchmark of Cinebench R11.5 and Windows operating system (via Bootcamp). Even the i5 CPU had some problems with the turbo clocks the maximum clock of the CPU was rarely used.
