Question Strange fan noise

[GhostWPT]

Hello, I recently noticed that I have a strange fan noise, it's like coil whine, but this strange noise is at one of my case fans. The noise is most audible whenever I play a game, and I don't know why. I also checked the RPMs with my software, I cranked the RPMs to the max and there was no noise, and also checked the RPMs at 50%, 75%, and even 25% but nothing, no strange noise, and as I said, the noise is audible when I play a game.
Any opinion will be much appreciated.

 

[CountMike]

Hello, I recently noticed that I have a strange fan noise, it's like coil whine, but this strange noise is at one of my case fans. The noise is most audible whenever I play a game, and I don't know why. I also checked the RPMs with my software, I cranked the RPMs to the max and there was no noise, and also checked the RPMs at 50%, 75%, and even 25% but nothing, no strange noise, and as I said, the noise is audible when I play a game.
Any opinion will be much appreciated.

Coil whine can happen with any coils and fan has at least 4. It usually happens only at certain frequency or loads.

 

[GhostWPT]

Coil whine can happen with any coils and fan has at least 4. It usually happens only at certain frequency or loads.

Yeah, I believe it has 4 coils, because it is a 120mm fan. It is weird, I have 6 fans of the same kind and only this one makes this strange noise at a certain load, in idle, there is no problem. As I said, it is audible whenever I play something, sometimes it's louder sometimes not that bad.