Clocking at 1.67, not 2.16

i just downloaded a small app that measures cpu temp
it says that my cpu is running at 1.67 Ghz, but my model is a 2.16Ghz
is this an error, or do I have to set the machine to run faster?

As everyone has said so far, Mac OS X throttles your CPU, whether it runs on battery or power adapter.
Ideally CPU throttling should only take place when on battery power, but it seems Apple has set it in all cases.
There is nothing wrong with this behaviour, but throttling is often not perfect and your system might not use your full processor power while running small processes. This might result in decreased performance in some areas.
I have a 1.83 GHZ chip and it usually hangs around 1.5 GHZ. I have not seen it rise to 100%.
All in all this is normal behaviour. It also reduces heat, keeps noise at a minimum (from not starting fans) and is of course, power efficient. I am sure OS X does handle your CPU clock speed efficiently. There is nothing to worry about.

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