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I am on a MacBook Pro with this processor:, computing a strictly single-threaded workload. Since the CPU has a clock speed of 2.3 GHz and a max Turbo Frequency of 3.4 GHz, I'd like to check whether the 3.4GHz is ever reached in practice. Can you please recommend a Mac OS X tool (possibly with a GUI) that shows that?

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I know this was posted a long time ago, but I'm surprised no one answered. I use these for my menubar and my dashboard, from iSLayer.

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The free Dashboard widgets do not show actual CPU frequency? – Maroloccio May 27 '11 at 6:09

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