17 minutes ago, hgpot said:
Maybe it just needs new fans, but recently they have been sounding pretty terrible like something was caught in them, but there is nothing that I can see. It was occasional at first, but now it is constant and sounds like something is failing/breaking. There are two fans, and the noise happens if either one (or both) is powered and running, but not if they are both unplugged/off. It used to be worse in my ITX case (basically whenever the fans sped up at all they made awful sounds, which was often in the poor case I had before), and it was fine for months since I've moved the system to the mATX.
I think for directly mounted fans like this, I want something with a static pressure focus like NF-F12?
The stock H80i fans are very noisy and replacing them would be my first recommendation.
An NF-F12 would be an excellent replacement.