I installed these fans as rear exhaust fans on my and my kid's gaming PC. They're quiet but not silent, which is normal as I can't hear them while gaming or listening to music. In terms of volume, it is similar to a ceiling fan, it is audible if you listen closely, but not obtrusively. I disconnected and removed the 4 pin Molex connectors as I know I won't be using them as they plug straight in. to motherboards. This keeps the PC cool at around 75-80 degrees internal case temperature. I know there are better fans out there that move more air and produce higher air pressure, but for the price they do a great job. I would buy them again if needed.
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