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I have an early 2011 MacBook Pro 13" and I'm supposed to be able to turbo boost up to 2.9GHz until the processor begins to overheat. Does anyone know of a utility that can monitor the current processor speed, as opposed to the "2.3GHz" that About This Mac shows?

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Bear in mind turbo boost kicks in only at very specific circumstances – Sathya Apr 5 '11 at 6:27
What kind of circumstances will cause a turbo boost? – wjl Apr 6 '11 at 0:47
up vote 1 down vote accepted

The Intel Power Gadget allows one to monitor the variable clock rate of the CPU on Apple Macbooks.

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Thanks, this does precisely what I was looking for! – wjl May 24 '13 at 20:06

I haven't used it and it doesn't look like a very professional site, but several forums referred to this site with a program called "CPU-x", which shows the frequency of the CPU. Using this should let you keep an eye on the processor speed.

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CPU-Z, it's parent on Windows, can do that. I'm looking at CPU-X on my machine right now and it's just showing 25MHz x 92.5 = 2300MHz. Static view, apparently. :( – wjl Apr 5 '11 at 1:55
Yeah, I found it while looking for an alternative to CPUz for Mac. It claims it's dynamic, but I guess that's incorrect. – nhinkle Apr 5 '11 at 2:47

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