What is quiet? Most silent gurus consider a good Japanaflo 80mm at 5V quiet as I mentioned in the above post.
You can find out what a Japanaflo 80mm @ 5V sounds like here:
SPCR's Test / Sound Lab: A Short Tour , page4. A word of warning: silencing can be addicting!
DrCR
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www.silentpcreview.com