SpeedStep

Intel Enhanced SpeedStep Technology
Design firmIntel
IntroducedQ1 2005[1]
TypeDynamic frequency scaling

Enhanced SpeedStep is a series of dynamic frequency scaling technologies (codenamed Geyserville[2] and including SpeedStep, SpeedStep II, and SpeedStep III) built into some Intel's 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.[1] Intel Speed Shift Technology (SST) was introduced in Intel Skylake Processor.[3]

Enhanced Intel SpeedStep Technology is sometimes abbreviated as EIST. Intel's trademark of "Intel SpeedStep" was canceled due to the trademark being invalidated in 2012.[4]

  1. ^ a b "Intel Pentium 4 Processor 660 Supporting HT Technology". ark.intel.com. Intel. 2005. Retrieved March 17, 2016.
  2. ^ Larabel, Michael (February 16, 2006). "Intel EIST SpeedStep". Phoronix Media. Retrieved August 9, 2010.
  3. ^ Howse, Brett. "Examining Intel's New Speed Shift Tech on Skylake: More Responsive Processors". anandtech.com. Retrieved June 26, 2020.
  4. ^ "Trademark Status & Document Retrieval". tsdr.uspto.gov. Retrieved April 26, 2020.