Fan rpms

[Brasdos]

I’m wondering what an ideal fan rpm would be for both a 120mm and 140mm fan. I saw a 120mm fan that had 2400rpm and a 140mm At 1200rpm. Which is better?

[IdiotPenguin]

I can’t really say what the ideal RPM is for fan sizes but the bigger the fan the less rpm it needs to have because it makes up for the speed in size so it’s also quieter. If you want to find out you should test it yourself to find the ideal place between noise and performance 

[Imbellis]

Ideally, the RPMs of the fans would be as low as possible while still maintaining reasonable temperatures.

Between those two fans, I'd choose a 140mm fan if possible. You'd be able to move more air at lower RPMs; therefore being more quite.

 

[jiyeon]

120mm fans at 2400RPM is loud, by the way.

 

In my experience with 120mm fans, 500-999 is normal while 1000-1500 is for load, anything higher is concerning.

[IdiotPenguin]

Just now, seoz said:

120mm fans at 2400RPM is loud, by the way.

 

In my experience with 120mm fans, 500-999 is normal while 1000-1500 is for load, anything higher is concerning.

Jokes on you I run my case fans on max since I have little care for silence!

[jiyeon]

Just now, IdiotPenguin said:

Jokes on you I run my case fans on max since I have little care for silence!

I pray for your electrical bill, my friend!  I imagine cooling is nuts at those speeds.

[LogicalDrm]

1600rpm max. So with control they will run at 1400rpm. But in all, rpms are irrelevant if all other qualities match. Noise level, CFM, price etc.

[WoodenMarker]

It varies depending on the fan and where it's being used. 

What fans are you looking at and where are you planning to use them?