Sorry Magictorch I was on doing 3 things at once (answering you and talking on two different Internet Relay Chat channels at the same time) and was in spelling "shortcut" mode
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IRC means: "If I Remember Correctly"....and as a double whammy I spelled it wrong
it should have been IIRC. Sorry about that.
Mine hummed more loudly the more juice I was pushing through it. The higher the OC, the louder the noise. When I had the system maxed out it was very noticeable. At idle stock speeds it was fairly quiet and you really had to "strain" to hear it. That was nearly a year and a half ago and its still going strong (just with a very mild Over Clock now).