View the current clock Speed of a CPU in OS X? Does anyone know of a utility to see the current speed of the processor? 

To be clear, I'm not looking for the model/speed of the CPU, but rather what the CPU is currently clocked at (i.e. it will reduce speed if it overheats).
There is a tool that does that called Intel® Power Gadget.

It will show the current load and Frequency



And Version 3.5.3 on macOS (latest is 3.5.5):