These fans are actually quiet for their RPMs and the amount of air that they move. And they are definately the quietest fan you'll be able to find for under $5. I purchased 3 of these when they were free after rebate a while ago and have them hooked up to fan controller, they are inaudible in my system below 1100rpm. At about 1500rpm, you start to be able to hear the the motor a bit. If you won't be using a fan controller or adjusting speeds from the BIOS and you need silence, you'll likely be looking to spend at least $15 for a quieter fan with similar performance.
I keep mine at about 850rpm (dead silent) on a 360mm rad and couldn't be happier.
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