[philso]

It seems from your posts that you are concerned about an audible noise coming from the VRM rather than electrical noise that you are measuring with some instrument like an oscilloscope. It also seems that you are not seeing any failure or mis-operation of any sort. If this is the case, ignore the audible noise. It is common for components in circuitry like the VRM to emit audible noise while operating correctly. The presence or absence of the audible noise is not a reflection on the reliability of the VRM.