HP 255 G8 CPU throttling

User_a_net · ‎07-01-2022

Question about HP 255 G8 laptop.

I decided to test the Ryzen 5 5500U CPU under load and watch the temperature and frequency change. And I saw the following picture, which most likely speaks of CPU throttling. The chart below shows the areas that exactly happened in this section of the chart:

The charger is connected.

1) Launched a stress test in CPU-Z (similarly if run in Aida itself).

The frequency rises to the maximum 4 GHz, the temperature jumps sharply to ~82°, then the cooler starts to spin up... The frequency abruptly drops to the operating 2 GHz and the temperature also drops. The cooler starts to work quietly.

Then everything is repeated in a circle.

2) Here I disconnected the laptop from the power supply and when running on battery power, it lowered the frequency of ~ 3 GHz and there were no jumps. The temperature was also stable.

3) Here I turned on the power saving mode on Windows and the frequency was limited to ~ 1.6 GHz. Everything is okay.

4) turned off energy saving.

5) connected the power. Surprisingly, the frequency remained ~3 GHz (as if from a battery) and did not try to rise higher. Everything is stable.

6) I stopped the stress test for a minute and resumed it again. Again, the same picture as in (1) with a constantly jumping frequency.

Perhaps the cooling cannot cope with the frequency of 4 GHz and constantly resets it to the working 2.1 GHz. But with a frequency of ~ 3 GHz, there are no problems, it works stably.

It seems to me that the cooler somehow reacts slowly to increasing the frequency. While it spins up and starts to cool, the CPU will already drop the frequency to the working one.

Someone like? Is this normal CPU operation for a laptop or is there a problem?

UPD: not at 98-100% CPU load, it can operate at frequencies of 3.5 GHz and not reduce the frequency. Since the temperature does not exceed the permissible.

erico · ‎07-02-2022

Is your notebook set to the default recommended by HP balanced power option?

Change it to performance to see if you note a difference.

Never mind about the performance setting.

I saw and replied to your other thread.

What you did with the stress test is what caused the lack of image to display on the notebook's display.

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