Yes, the frequency is abnormal in the initial stage of startup.
In the early stages of startup (before the fan stops) there will be what I described above.
Power on: 25kHz (lasts about 2s)
Noise generation: 1.13kHz (lasts about 3 seconds)
Frequency increase: 60~100kHz (lasts about 10 seconds)
Fan stop.
Fan starts again:
Enter the system desktop: 25kHz (maintain)