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Cpu clock

CPU clock (frequency) data is basically obtained via the kernel driver.

There are broadly three types of CPU clock data.

① CPU frequency obtained without using a driver
② Frequency recalculated from CPU multiplier using driver (variable clock option)
③ Effective clock derived from AMD Ryzen Master (route using the AMD Ryzen Master driver)


As for the content of 1, although there are some Intel notebook PCs whose frequency goes up and down, it basically does not change depending on the amount of load.
It will be obtained even if none of the drivers can be used, but basically it will only show the frequency of the basic specifications within the error range. You may think so.
This content fluctuated depending on the load, except for some laptop CPUs, up to CPUs around the time when 64-bit CPUs were introduced or before that.
Currently, for both the CPU Intel and the CPU AMD, this value almost always shows the maximum value.


The content of 2 is to recalculate the result of 1 using a multiplier, etc., and for the Intel CPU before the P core E core appeared, the content is usually approximately correct.
Since this is very old logic, the content is far from the actual situation, at least for the Ryzen CPU.
Also, other than Ryzen CPU, it may indicate something other than a major value.
This is an area that cannot be confirmed or tested unless someone has the actual machine (hardware with the target physical CPU installed).


The content of 3 requires an understanding of the specifications of AMD and Ryzen and what an effective clock is.
First of all, the recent AMD and Ryzen CPUs do not lower the effective clock even when idle.
This area is affected by power option settings and profiles, but the Ryzen CPU clock frequency visible from the OS and task manager always shows almost the maximum value.
However, even though the frequency remains the same internally, there are places where calculations are performed and places where they are not, and the number of clocks that are running and the number of clocks that are actually performing calculations are significantly different. This is the specification.
The equivalent value of the clock number that indicates the part that is actually operating is the clock number called the "effective clock."

Therefore, when using the AMD Ryzen Master driver, it will show a completely different value when compared to the non-effective clock number of the task manager, etc., but this is a problem with the internal specifications of the Ryzen CPU, so it cannot be obtained at all. thilmera This is not an internal calculation error, unless the case or the reference position within the driver has been changed due to a version update on the driver side.
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