Hi bluefront,
I just checked one of our 140mm-Fans used for the Zipang and in my opinion it is really really silent at 12V and 7.5V - so why do you try to run this at 5V?
Regarding the YateLs: As far as I know, these fans have problems starting at voltages even higher than 5V - I was using one 120mm Yate and this even refused starting at ~6.5V.
Cheers,
Stefan
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