For a while now I've been trying to identify the source of an irritating high pitched whining noise from inside my case. After swapping out my Antec PSU for a Seasonic one I have now found the culprit to me my Arctic Cooling Freezer 64 CPU Fan. What is causing the noise is the fan blowing air onto the silver fins above it, creating a windy, whistling-like noise. Here's a pic of the Freezer 64 to better illustrate what I mean:-
When I push those 2 black things on the fan holder ever so slightly, the noise stops completely. I've had the fan off, and have tried tightening the screws etc all to no avail. I thought about tieing the 2 black arms together to create enough tension to stop the noise but don't know what material to use for it. My latest idea is to have something covering the fins above the fan altogether. I tried sliding a thin bank card under there and it worked perfectly - no noise. Should I do something like this? I mean it doesn't affect the airflow as the fan blows at the CPU and around the rest of the case. All help much appreciated.