ML120 fan rattling and slower

[Krag89]

Hi, I'm kind of new when it comes to AIO coolers, last year I bought a Corsair H100i PRO RGB 240mm which I believe comes with ML120 fans, it's been going great until a few days ago when one fan started making a ton of noise above 400RPM, when it does it's also much slower than the other fan, I'm talking like 500/900 when it rattles like mad but generally it's still around 25RPM slower even when the rattling doesn't occur (putting both on Fixed % they actually run at the same RPM so it might not matter) . Putting the fan on Zero RPM and then back on after a few minutes sometimes fixes, sometimes it doesn't, sometimes the sound only starts after it's been pushed into higher RPMs.

 

Below is the RPM diffrence when both are set to Fixed % while the rattling occurs:

 

Is there any fix for this? Or should I replace it? What are some alternatives considering the AIO is cooling a i9-9900K (so it runs pretty hot)?

I've heard people recommend NF-F12, NF-A12, Artic P12 I'm not sure if replacing just one fan makes sense, and how a non Corsair fan would interact with iCue.

 

Thank you.

Edited January 4, 2021 by Krag89

[Krag89]

Ended up replacing it with a NF-A12x25 which is perfectly recognized by ICUE.

[LeDoyen]

if you bought it last year, it should still be under warranty. You could contact Corsair support and maybe get a replacement (Support ticket system on the forum menu).