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Fan voltage vs rpm vs noise produced

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imported_DonkeyBoy

Junior Member
I bought a silverstone nimiz case and the two rear exhaust fans it comes with dont push enough air through a radiator. These fans run around 2000 rpm and are VERY quiet.

But since i have a vantec nexus fan controller (7V - 12V), i was looking at the panaflo U1As to replace these two exhaust fans.

so heres the question, does voltage affect the rpm of a fan in a linear fashion? As in, if u divide the rpm the fan runs at 12V by 12, u can then find the rpm the fan will run under 7V simply by the formula:

[ (RPM@12V) / 12 ] * (New Voltage) = New RPM

because if this is true, the U1A will run at around 2000 rpm@7V, the same rpm as the existing fans@12V.

so is my "logic" correct?

and also, can i expect the panaflo U1A@7V to be as quiet (if not quieter) than the current fans at 12V? since they are spinning at the same rpm?
 
RPM will follow voltage supplied in a fashion close enough to linear. This only applies after the minimum voltage required to overcome inertia (4-5V usually). As for noise level, with all other things being equal, two fans at the same speed will make the same noise. Problem is, between two different manufacturers, all other things are not equal, and enough so that it's unlikely they'll make a similar amount of noise. I'd say you'll find with Panaflow that they'll be much quieter at 2000 rpm than your current fans.
 
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