I have a Coolermaster Hyper 212 Evo and this noise becomes audible at about 1500 RPM. As far as I can tell there are no wires hitting the fan, so I'm not sure why its making this noise. Could anyone help me figure out the solution? Here is a video of the noise, the fan is running at 2000 RPM in the video so the noise is quite loud. [video="https://www.youtube.com/watch?v=rAnEjXHlzO8&feature=youtu.be"][/video]This is how it sounds playing something like Wolfenstein. Is this because the fan isn't ment to be used at such a high RPM? Should I cap it at 1000 RPM? Thanks.