Apple - How can I tell when Turbo Boost is active on my MacBook?

Check out the Intel Power Gadget. It provides info about the processor frequency in GHz and Processor Power in W.

there's 2 utilities that could provide that info,

• one from Intel called MacCPUID (http://software.intel.com/en-us/articles/download-maccpuid/)

• other called CPU-X (http://netkas.org/?p=72) rather outdated

Hope this helps.

Karl