Intel Turbo Boost
Intel Turbo Boost is Intel's trade name for a feature that automatically raises certain of its processors' operating frequency, and thus performance, when demanding tasks are running. Turbo-Boost-enabled processors are the Core i5, Core i7, Core i9 and Xeon series manufactured since 2008, more particularly, those based on the Nehalem, Sandy Bridge, and later microarchitectures. The frequency is accelerated when the operating system requests the highest performance state of the processor. Processor performance states are defined by the Advanced Configuration and Power Interface (ACPI) specification, an open standard supported by all major operating systems; no additional software or drivers are required to support the technology. The design concept behind Turbo Boost is commonly referred to as "dynamic overclocking".
When the workload on the processor calls for faster performance, the processor's clock will try to increase the operating frequency in regular increments as required to meet demand. The increased clock rate is limited by the processor's power, current, and thermal limits, the number of cores currently in use, and the maximum frequency of the active cores. Frequency increases occur in increments of 133 MHz for Nehalem processors and 100 MHz for Sandy Bridge, Ivy Bridge, Haswell and Skylake processors. When any electrical or thermal limits are exceeded, the operating frequency automatically decreases in decrements of 133 or 100 MHz until the processor is again operating within its design limits. Turbo Boost 2.0 was introduced in 2011 with the Sandy Bridge microarchitecture, while Intel Turbo Boost Max 3.0 was introduced in 2016 with the Broadwell-E microarchitecture.
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A similar feature called Intel Dynamic Acceleration (IDA) was available on many Core 2 based Centrino platforms. This feature did not receive the marketing treatment given to Turbo Boost. Intel Dynamic Acceleration dynamically changed the core frequency as a function of the number of active cores. When the operating system instructed one of the active cores to enter C3 sleep state using the Advanced Configuration and Power Interface (ACPI), the other active core(s) dynamically accelerated to a higher frequency.
Intel Turbo Boost Technology Monitor, as a GUI utility, could be used to monitor Turbo Boost; this utility has reached the end-of-life state by no longer supporting Intel processors released after Q2 2013, and is no longer available.
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[...] processors based on the Nehalem microarchitecture feature a dynamic overclocking mechanism (Intel Turbo Boost Technology) that allows the processor to raise core frequencies as long as the thermal limit is not exceeded.
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Intel Core Microarchitecture (Nehalem) based processors incorporate a new feature: Intel Turbo Boost technology.
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Intel Corporation introduced its most advanced desktop processor ever, the Intel Core i7 processor. The Core i7 processor is the first member of a new family of Nehalem processor designs [....]
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- Intel Turbo Boost Technology 2.0
- Intel program to graphically show Turbo Boost
- Intel® Turbo Boost Technology Monitor overview
- Turbo Boost reporting tool for Linux
- What Is Turbo Mode on the Intel Processor?
- Evaluation of the Intel Core i7 Turbo Boost feature, by James Charles, Preet Jassi, Ananth Narayan S, Abbas Sadat and Alexandra Fedorova