Windows 10: My laptops cpu throttles to 0.88 ghz when plugged in and returns to normal when unplugged

Hi, I'm wondering about why my laptops cpu gets limited to 34 percent utilization and only runs at 0.88 GHZ when on ac charge and returns to normal when unplugged. I am set to high performance mode on my battery settings in windows and my computer isn't overheating as i changed the thermal paste just yesterday. the cpu in question is an intel core 2 duo t9500 which is meant to run at a speed of 2.6 ghz when I'm fully utilizing it but as I stated before it is only running at a fraction of that speed. I also have another laptop that has a similar problem but only to a worse extent, throttling

:)

 

CPU frequency locks at 0.78 GHz

Hello,

My CPU get locks at 0.78 GHz and not going up or down. In the same time when CPU is locked at 0.78 GHz,

laptops fans runs fast (noisy) but the coming air is not even hot.

I have found a tool named Intel(R) Extreme tuning utility to use it as monitor of "what's going on with my system",

i'm not overclocking or changing something in CPU.

Tuning utility shows value of "Thermal Throttling" as 100% i think this is the reason why CPU stays at 0.78 GHz, it get down step because of this thermal throttling.

CPU package and core temperature is normal around 40c .

All this information is visible into this picture:



With random combination of reboots, shutdown unplug power and plug power CPU gets frequency stepping again

Thermal Throttling is becoming zero and fans stop... and everything goes normal.

Can someone explain what is connection between Windows (10) OS and CPU freq. stepping.

I think there is some connection because of available options in power plan settings, there is options Processor power management

that can control CPU min and max freq. state, but i'm not pretty sure is it related to "Thermal Throttling".

 

Dell CPU Throttling while charging (0.46 GHz)

This is my laptop's issue when it's been bought. When it is plugged in, it is throttled to 0.48 GHz

, while if it is not charging, it can go up to 2.56 GHz. I tried removing the battery and plugged the charger, but it is still throttled. What can I do? Thank you for the future answers.

 

Dell CPU Throttling while charging (0.46 GHz)

during the charging did you try to run any CPU stress tools to see the difference?