It's really bothering when I hear the weird noises from PC fan which is caused by CPU fan when CPU load is high. On CPU fan high rpm (e.g. while gaming) a noise from the fan installed on the side door is heard. I found the issue actually but I don't know what's the best solution to it.
When CPU fan rpm goes high an erratic vibration is transferred to the side door and the installed fan on it vibrates. I was able to determine that this weird noise is produced in cause of a little space (limitation) in which fan shaft can move freely forward. (I think this free space is because of a matter of balancing).
As CPU fan high load, side door fan gets a horizontal movement on its shaft and noise is heard.
Is there any way to lower this space or is there a good external solution to it so that shaft won't have ability to move?