Intel Turbo Boost

Intel Turbo Boost is Intel's trade name for central processing units (CPUs) dynamic frequency scaling feature that automatically raises certain versions of its operating frequency when demanding tasks are running, thus enabling a higher resulting performance.

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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.[1] The design concept behind Turbo Boost is commonly referred to as "dynamic overclocking".[2]

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.[1]

Turbo-Boost-enabled processors are the Core i3, Core i5, Core i7, Core i9 and Xeon series[1] manufactured since 2008, more particularly, those based on the Nehalem, and later microarchitectures.[3]

Support across CPUs

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.[1][4] 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.[1][5][6][7]

A feature of Turbo Boost 2.0 is that it introduced time windows with different levels of power limits, so that a processor can boost to a higher frequency for a few seconds. These limits are configurable in software for unlocked processors. Some motherboard vendors intentionally use values higher than Intel's default for performance, causing the processor to exceed its thermal design power (TDP).[8]

Some Intel Core X Processors and some newer Intel Core Processors (e.g. 10th Gen Desktop Core i7) support Intel Turbo Boost Max 3.0 Technology. Newer version Windows 10 and Linux kernel support Intel Turbo Boost Max 3.0 Technology.[9]

History

An Intel November 2008 white paper[10] discusses "Turbo Boost" technology as a new feature incorporated into Nehalem-based processors released in the same month.[11]

A similar feature called Intel Dynamic Acceleration (IDA) was available on many Core 2 based Centrino platforms.[12] 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.[13]

See also

References
  1. "Intel Turbo Boost Technology 2.0". Intel.
  2. Molka, Daniel; Daniel Hackenberg; Robert Schöne; Matthias S. Müller (September 2009). "Memory Performance and Cache Coherency Effects on an Intel Nehalem Multiprocessor System". 2009 18th International Conference on Parallel Architectures and Compilation Techniques. 18th International Conference on Parallel Architectures and Compilation Techniques. pp. 261–270. doi:10.1109/PACT.2009.22. ISBN 978-0-7695-3771-9. [...] 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.
  3. "Intel Broadwell-E HEDT Core i7 Processors Launching on 30th May - Official Prices and Specifications Confirmed". 27 May 2016. Retrieved 28 June 2016.
  4. "Intel Xeon Processor E5 v3 Product Family: Processor Specification Update" (PDF). Intel. November 2014. pp. 8–11. Retrieved December 2, 2014.
  5. "Download Intel® Turbo Boost Max Technology 3.0". DownloadCenter.Intel.com. 2016-10-22. Archived from the original on 2018-10-19. Retrieved 2017-04-01.
  6. "Power management architecture of the 2nd generation Intel Core microarchitecture, formerly codenamed Sandy Bridge" (PDF). Hotchips.org. Retrieved 2017-04-01.
  7. Angelini, Chris (2011-01-02). "The System Agent And Turbo Boost 2.0". Tom's Hardware.
  8. Cutress, Ian. "Why Intel Processors Draw More Power Than Expected: TDP and Turbo Explained". AnandTech.
  9. "Frequently Asked Questions about Intel Turbo Boost Max Technology 3.0". Intel.com. Intel. Retrieved 2020-06-16.
  10. "Intel Turbo Boost Technology in Intel Core Microarchitecture (Nehalem) Based Processors" (PDF). Intel Corporation. November 2008. p. 5. Retrieved 2015-05-07. Intel Core Microarchitecture (Nehalem) based processors incorporate a new feature: Intel Turbo Boost technology.
  11. "Intel Launches Fastest Processor on the Planet" (Press release). Intel. 2008-11-17. Retrieved 2010-05-13. 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 [....]
  12. "Tech ARP - Where the best in technology gather - Tech ARP". Tech ARP. 19 December 2015. Archived from the original on 21 July 2011.
  13. "Intel Turbo Boost Technology Monitor Does Not Support 4th Generation Processors". intel.com. Retrieved 22 February 2015.
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