CPU clock speed changing rapidly

Evojin · Sep 26, 2014

I recently overclocked my CPU and have installed a couple monitoring programs, AIDA64, CoreTemp and CPUID CPU-Z. I have noticed my clock speed jumping around every second. I have it set to 4.0 GHz but it sometimes goes as low as 1.4 GHz and then jumps to 3.2, 2.4, 1.9, all over the place.

So the question. Is it normal for your CPU's speed to fluctuate so greatly? Should I be concerned or is this just the CPU regulating itself?

MeteorsRaining · Sep 26, 2014

The Turbo boost seems to be doing its part. Its completely normal, when the load is less, it auto-downclocks, and accordingly pushes up the clock with the load.

JackNaylorPE · Sep 26, 2014

It's supposed to do that ... why burden the CPU id its experiencing no load.

Downlaod and run HWiNFO64 and RoG Real Bench ... run the stress test and watch core speed in HWiNFO

EasyLover · Oct 24, 2014

Normally, this is a default behavior of the CPUs. At idle their clocks are low but under load the clocks can vary depending upon the clock. Which CPU it is?

jbrianj · Aug 26, 2016

Since this is still on Google's top list for the question "cpu clock speed changing rapidly" and the answers are all wrong. This is NOT default CPU behavior, this is NOT "Turbo doing it's work". This is the doing of Microsoft Windows power saving features. If you check the advanced power plan settings of balanced you can see Windows "Minimum clock speed" is 15% and "Maximum clock speed" is 100%. Change this to high performance and the clock speeds do not change.

Windows makes use of a power saving feature that is exposed to almost any CPU/Mobo called "SpeedStep Technology" that allows the clockspeed to be dynamically changed by software.

This is exposed as EIST(Geyserville-III) by most 2012+ CPU's due to Intel losing the trademark "SpeedStep"

For Desktop's these power savings are very minimal because maximum clock speed does not equal maximum power usage. Only when the CPU is running at 100% load that is when there's "maximum power usage" which has nothing to do with clock speed.

P.S. the name of this feature for AMD CPU's is Cool'n'Quiet

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CPU clock speed changing rapidly

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