SpeedStep

Intel Enhanced SpeedStep Technology
Design firm	Intel
Introduced	Q1 2005
Type	Dynamic frequency scaling

Enhanced SpeedStep is a series of dynamic frequency scaling technologies (codenamed Geyserville and including SpeedStep, SpeedStep II, and SpeedStep III) built into some Intel microprocessors that allow the clock speed of the processor to be dynamically changed (to different P-states) 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 (SpeedStep III) 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 in Intel Skylake Processor.

Enhanced Intel SpeedStep Technology is sometimes abbreviated as EIST. Intel's trademark of "INTEL SPEEDSTEP" was cancelled due to the trademark being invalidated in 2012.

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