Is this Normal Fan Behavior at Boot ?

[christizzz]

Motherboard asus prime x470 pro cpu: r5 3600 ram: gskill ripjaws 16gb at 3200

the fans (only the rear exhaust and the cpu) turns on for a second and then stops ..then turns on again and the pc starts normally...

https://drive.google.com/file/d/11KJdn2qoiGCEulMZjVFXjxGrt3BLI7YN/view?usp=drivesdk

My old z170 with 6600k didnt have this behavior...

thanks

[RedSector73]

I've never seen any asus board act like that on startup. It does not seem normal to me but I don't own the board you have shown and maybe that is normal for it.

[OutSider420]

Most if not all of the newer boards start up for a second then boot normally. I think it’s testing ram or something.
It only does this if you flick the PSU switch or it loses power.
A normal cold boot should not have this issue