Question Why would 940MX GPU throttles when laptop is charging? Runs much better on just battery.

[vikaskumar2299]

I have Dell Inspiron 7570 laptop with 940MX 4GB GPU.

If I play GTA5 on just battery, the GPU clocks are above 900 MHz.

But as soon as I plug it in, it keeps fluctuating between 900 to around 400 MHz every 2-3 minutes. I mean game will run smooth for couple of minutes then for next couple of minutes it will become slow. It keeps going on like that. I don't know why.

There are no power saving settings I have set up that maybe cause laptop under-perform when plugged in. So I really don't understand why does it happen.

On the other hand, on some games like Counter Strike 1.6, game actually runs more smooth when plugged in. And I could understand it and that's like normal behavior.

So why would a laptop GPU throttle when plugged in? Is it a problem or normal behavior?

 

[kerberos_20]

what are your gpu temperatures?
otherwise why would it throttle, more heat from battery pack during charging, more heat from CPU

 

[vikaskumar2299]

what are your gpu temperatures?
otherwise why would it throttle, more heat from battery pack during charging, more heat from CPU

GPU temperatures are like 66 to 70 degree celsius. CPU cores are around 75 C.