Question Why are NZXT H400 case fans so loud?

WhoIsJOB

Reputable
Mar 9, 2016
10
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4,510
As stated, my case's 3 x NZXT Aer F 120mm fans are really loud.

I have each plugged into a different fan header on my MSI B450M Mortar, and MSI's Command Center shows their RPM is between 1200-1400rpm.
I cannot get them slower (tried the BIOS, Speedfan and Command Center) and their rated max speed is 1500rpm - they are therefore running at 75-90% power.

Funny thing is, Speedfan doesn't even recognize them or my CPU fan (although that one is acting normal), only the XFX R9 290X. And when I used DC mode in the BIOS, they either switch off or run at those rpm's again.

Does anyone have a solution for this (apart from buying new fans and then maybe being stuck with them at those rpm's as well - although the Corsair fans are looking appealing atm)?