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At the same RPm, the noise diff is negligible, but the AcoustiFans are quieter. If you have a fan controller already, I would get some faster fans, and throttle them down.

I will check the Papst m ...

Nice review of the fan! Smile

However I'm still wondering what I should buy. BTW what's the model of the Papst fan you have?

If possible can you run both fans at identical RPM's or try to as ...