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
Essentially, EIST throttles the clock speed of a central processing unit (CPU) during periods requiring minimal demand. It then brings the clock speed back up to its maximum potential when demanded by the load . This allows a computer to save power when there is less to process, yet still achieve high performance when the demand is high.
The earlier, non-enhanced version of SpeedStep switched frequency and voltage between low and high levels in response to a current processor load. EIST builds on this by using the following strategies:
EIST reduces the latency inherent with changing the voltage-frequency pair (P-state), thus allowing those transitions to occur more frequently. This allows for more granular, demand-based switching and can optimize the power-to-performance balance, based on the demands of the applications.
Used for : Intel Atom, Intel Celeron, Intel Core 2, Intel Core i3, Intel Core i5, Intel Core i7, Intel Pentium, Intel Pentium 4, Intel Pentium M, Intel Xeon