Dynamic frequency scaling technology
Also known as Intel SpeedStep
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Enhanced SpeedStep is a series of dynamic frequency scaling technologies built into some Intel's microprocessors that allow the clock speed of the processor to be dynamically changed by software. This allows the processor to meet the instantaneous performance needs of the operation being performed, while minimizing power draw and heat generation. EIST was introduced in several Prescott 6 series in the first quarter of 2005, namely the Pentium 4 660. Intel Speed Shift Technology (SST) was introduced with Intel's Skylake microarchitecture.