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AMD PowerTune is a trademark for a series of dynamic frequency scaling technologies built into some AMD GPUs and APUs 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, heat generation and noise. AMD PowerTune aims to solve thermal design power and performance constraints. Besides the reduced energy consumption, AMD PowerTune helps to lower the noise levels created by the cooling in desktop computers, and extends battery life in mobile devices. AMD PowerTune is the successor to AMD PowerPlay. Support for "PowerPlay" was added to the Linux kernel driver "amdgpu" on November, 11 2015.〔(【引用サイトリンク】title=Add amdgpu powerplay support )〕 As a lecture from CCC in 2014 nicely shows, AMD's x86-64 SMU firmware is executed on some LatticeMico32 and PowerTune was modeled using Matlab.〔(【引用サイトリンク】title=AMD x86 SMU firmware analysis )〕 This is similar to Nvidia's PDAEMON, the RTOS responsible for power on their GPUs. == Overview == AMD PowerTune was introduced in the TeraScale 3 (VLIW4) with Radeon HD 6900 in Dec 15, 2010 and has been available in different development stages on Radeon- and AMD FirePro-branded products ever since. Over the years, reviews which document the development of AMD PowerTune have been published by AnandTech.〔(【引用サイトリンク】title=Redefining TDP With PowerTune )〕〔(【引用サイトリンク】title=Introducing PowerTune Technology With Boost )〕〔(【引用サイトリンク】title=The New PowerTune: Adding Further States )〕〔(【引用サイトリンク】title=PowerTune: Improved Flexibility & Fan Speed Throttling )〕 An additional technology named AMD ZeroCore Power has been available since the Radeon HD 7000 Series, implementing the Graphics Core Next microarchitecture. The pointlessness of a fixed clock frequency was accredited in January 2014 by SemiAccurate.〔(【引用サイトリンク】title=What is AMD’s PowerTune 2.0 and what does it do? )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「AMD PowerTune」の詳細全文を読む スポンサード リンク
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