Enhanced SpeedStep is a series of dynamic frequency scaling technologies 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 was introduced in
several Prescott 6 series in the first quarter of 2005, namely the Pentium 4 660.
Make sure all the hardware support EIST, ex: CPU, operating system, etc. Enter
BIOS setting and set [Advanced BIOS Features] > [CPU EIST Function] to [Enable
]. Different Power Management setting requires in Windows: Windows XP: set up
Enhanced Intel SpeedStep Technology (EIST) is a power and thermal
management technology developed by Intel. EIST was introduced as a means of
enabling high performance while meeting the power-saving needs of a mobile
Feb 16, 2006 ... Nearly seven years ago at the Intel Developer Forum in Palm Springs California,
Intel had first demonstrated Geyserville Technology. This dual-speed technology,
when paired with a 0.18-micron mobile Pentium processor, ...
Feb 16, 2006 ... With the load results, there was an approximate 14°C difference in the
temperature between 800MHz and 1.86GHz, and a 6-13 Watt difference. There
was also an impressionable difference between the idle and load ...
Intel Speedstep/EIST. This is to help with the increasing number of 'Why does my
CPU speed keep changing' threads. For those users of Intel CPU's you may
discover that your CPU has a habit of changing the multiplier down to 6x then