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Grestorn

CPU Clock monitoring on Zen

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Hi, 

after a very long time of using my old 5960x system and AIDA64 passively, I'm now building a new machine based on Zen 2, and because of that I'm interested in the latest developments once again. 

I've just read this article about issues with AMD Zen's CPU clocking mechanics: 

https://www.techpowerup.com/review/1usmus-power-plan-for-amd-ryzen-new-developments/

What stands out there is the statement of HWInfo's author, he claims that the "traditional" way of measuring a CPU (core) clock has several issues, which is something I've been wondering for quite some time myself.

So HWInfo implemented "a new approach needs to be used called the Effective clock. This method relies on hardware's capability to sample the actual clock state (all its levels) across a certain interval, including sleeping (halted) states. The software then queries the counter over a specific polling period, which provides the average value of all clock states that occurred in the given interval." 

I certainly don't want to change to HWInfo, I'm used to AIDA64 and it's working very well in my system. So what's your stance on that statement? How is AIDA64 measuring the cpu core clocks? Is that approach already used there, too? If not, are you planning to? Or do you have a completely different view on the issue?

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On ‎12‎/‎3‎/‎2019 at 7:42 AM, Grestorn said:

Hi, 

after a very long time of using my old 5960x system and AIDA64 passively, I'm now building a new machine based on Zen 2, and because of that I'm interested in the latest developments once again. 

I've just read this article about issues with AMD Zen's CPU clocking mechanics: 

https://www.techpowerup.com/review/1usmus-power-plan-for-amd-ryzen-new-developments/

What stands out there is the statement of HWInfo's author, he claims that the "traditional" way of measuring a CPU (core) clock has several issues, which is something I've been wondering for quite some time myself.

So HWInfo implemented "a new approach needs to be used called the Effective clock. This method relies on hardware's capability to sample the actual clock state (all its levels) across a certain interval, including sleeping (halted) states. The software then queries the counter over a specific polling period, which provides the average value of all clock states that occurred in the given interval." 

I certainly don't want to change to HWInfo, I'm used to AIDA64 and it's working very well in my system. So what's your stance on that statement? How is AIDA64 measuring the cpu core clocks? Is that approach already used there, too? If not, are you planning to? Or do you have a completely different view on the issue?

Our stance is still that AIDA64 measures the immediate value.  I don't think measuring an average clock frequency instead of that is a good idea.  But, if you're looking for a long-term measurement to find out an average CPU clock frequency for a timespan, you can use the Logging facility of AIDA64 or the Statistics tab of the AIDA64 System Stability module.

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I think this is not about averaging. It's about the issue that using a discreet multiplier to calculate the frequency is simply wrong for Ryzen. 

That's why Ryzen Master shows such a vastly different core frequency than AIDA64. 

In HWInfo shows an "effective CPU clock" for each core, which actually reflects the value Ryzen Master is showing. See this: https://www.hwinfo.com/forum/threads/effective-clock-vs-instant-discrete-clock.5958/

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