What is Turbo Clock:
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In Intel, Turbo Clock/Boost is a technology implemented in certain versions of their Nehalem-, Sandy-Bridge-, Ivy-Bridge, and Haswell-based CPUs, including Core i5 and Core i7 that enables the processor to run above its base operating frequency via dynamic control of the CPU's clock rate.
It is activated by itself when the operating system requests the highest performance state of the processor.