Hi,
MyASUS is version 3.0.29.0. The test seems to sometimes report fan problems, then other times say everything is ok, but it seems from what you are saying this is an issue with MyASUS version.
I will get back with the BIOS version, but here is the screenshot of armoury crate. You can see the Nvidia HUD showing 0 rpm on the GPU fan, but armoury crate showing it is working..
Thanks!