Difference between these?

If they are PWM then you may as well get the faster/louder fans and dial them down.

That's sort of what I meant by the question. If they are PWM fans, surely when being controlled by a PWM controller the faster ones can be slowed down to a similar speed to the low noise ones, but also come with a higher max RPM.

So essential the low noise ones are pointless, since the higher pressure ones can be controlled to act like them? Does that make sense lol?
 
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