Which fan starts to hum?

Question

Iron

Tell me, when I turn the game into a window, the fan starts spinning more calmly, when I open it, it “takes off” again, is it on the video card or on the processor?
It's just hard to tell from the sound.

Answer 1

something questions from class 1, take your hand stop the cooler from the processor and compare the noise

Answer 2

The power supply, in 99% of cases, then the video, then the processor.