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What makes GPU fans so quiet?

post #1 of 14
Thread Starter 
Okay so the WindForce cooler's fans are running at around 2000rpm right now and I can't even hear them.

A 120mm fan at that speed would be making quite a bit of noise.

What gives? Or rather, what am I missing!

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post #2 of 14
The fans themselves are better quality overall...
Also the fact that it's right against the circuit board technically isn't pushing as much air as lets say... a heatsink which would also cause more noise...

i'm no expert though...
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post #3 of 14
Thread Starter 
I see.

Now I must know more... what makes them better quality?
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post #4 of 14
I suppose one factor is the bearings and motor used. Another thing is that a 120mm fan displaces a lot of air at 2000RPM, quite a bit more than your GPU fans probably do.
post #5 of 14
Thread Starter 
Quote:
Originally Posted by t-ramp View Post
I suppose one factor is the bearings and motor used. Another thing is that a 120mm fan displaces a lot of air at 2000RPM, quite a bit more than your GPU fans probably do.
But I take it the GPU fans must have a higher static pressure, though?
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post #6 of 14
I would imagine they're not forcing air as much as the blower-type fans on the stock cards do, which would affect the noise created.
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post #7 of 14
They're typically smaller and in a more open frame than case fans, they're software-controlled PWM, plus they are deep inside the case so their noise contribution is less noticeable. Plus, on the windforce fans especially, the heatsink is supposedly designed for "less turbulence" (if I'm reading this right, got the box right here).
post #8 of 14
Thread Starter 
Cool, thanks guys!

Thank god for all those reasons, else we'd have a slight problem I think

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post #9 of 14
this is the 1st time I've heard GPU fans being accused of being quiet
post #10 of 14
Quote:
Originally Posted by tompsonn View Post
Okay so the WindForce cooler's fans are running at around 2000rpm right now and I can't even hear them.

A 120mm fan at that speed would be making quite a bit of noise.

What gives? Or rather, what am I missing!

You are comparing a 80mm@2000RPM vs 120mm@2000RPM. If you want to compare airflow, you should be comparing a 80mm@2000RPM vs a 120mm@~1000RPM.

Large fans are quieter for their output.
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