hahaha.. Somebody trying to find a nice mate for their big momma? ;> haha.. Here's a good place to keep an eye one, they stock surplus fans now and then, but I was unable to find 6" (160mm) fans below 50db, most were near 60db.. Damn near bathroom vent fans or stove vent fans..
www.mpja.com
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The UnaClocker
Overclock till it goes BOOM!
Watercooler extraordinaire!