The Art Of Zen
HWM Singapore|April 2017

A brief introduction to Sense MI and the Ryzen CPU.

Zachary Chan

Any high-level overview of AMD’s Ryzen processors will mention a set five of technologies collectively known as Sense MI. These include Pure Power, Precision Boost, extended Frequency Range (XFR), Neural Net Prediction and Smart Prefetch.

Pure Power and Precision Boost

Pure Power and Precision Boost control voltage and operating frequency of the Ryzen processor. This concept isn’t new as every modern processor features some form of voltage and boost frequency range to optimize performance-per-watt depending on workload.

What makes Ryzen different however is how fine grained this control has become. AMD claims Ryzen has more than a thousand embedded sensors distributed per core complex that continuously analyzes power, operating temperature and frequency. Ryzen processors won’t just be able to respond to varying workload needs with greater efficiency (as fast as 1ms), but with finer granularity as well (25MHz adjustments compared to 100MHz of past generations). The effect of Pure Power and Precision Boost combined is to better optimize performance per-watt of a Ryzen CPU at any workload with a goal to reduce power consumption while maintaining similar performance compared to previous architectures.

Extended Frequency Range 

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