Semiconductor & Computer Engineering
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== See also == | == See also == | ||
* Intel's {{intel|Frequency Behavior}} | * Intel's {{intel|Frequency Behavior}} | ||
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Revision as of 12:03, 12 January 2018
The Frequency Behavior of AMD's CPUs is complex and is governed by multiple mechanisms that perform dynamic frequency scaling based on the available headroom.
Overview
AMD has implemented a number of mechanisms into their architectures to extract additional performance through higher frequency whenever the power and thermal budgets allow.
- Precision Boost - Introduced with Zen in 2017
- Precision Boost 2 - Introduced with Zen-based Mobile in 2017
- eXtended Frequency Range (XFR) - Introduced with Zen in 2017
- Mobile eXtended Frequency Range (mXFR) - Introduced with Zen-based Mobile in 2017
For AMD's Ryzen brand (i.e. Ryzen 3, Ryzen 5, and Ryzen 7, the maximum turbo frequency is govern by three parameters: All Boost, Max Turbo, and XFR Boost. With only one to two active cores, the processors can hit the Max Turbo. However, anything in excess of two active cores, the processor drops to an All Boost frequency.
For AMD's EPYC brand, the Max Turbo is defined for 12 or less active cores as opposed to two like Ryzen.
See also
- Intel's Frequency Behavior