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post #141 of 780
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Revisiting Fans #10, #12, and #14:







All noctua fans in all their glory. NF-P12 is the one that stands out, and I still don't understand why the NF-S12B needs a LNA. It's dead quiet as it is.
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post #142 of 780
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Revisiting Fans #1, #8, #11, #20:









The results for the GT AP-15s are a bit deceiving. While the Noise output seems to be acceptable, the buzzing noise is downright intolerable. It's just something the DB meter won't pickup.
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post #143 of 780
Yay updates.
    
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post #144 of 780

Excellent work, subbed.

 

Quote:
Originally Posted by Cyclops View Post
To calculate Noise to Temperature rating I simply add Delta temperature to Noise and divide it by 10. Lower values are better.

What does the Noise to Temperature Rating mean? (e.g. C*/W is Celsius per Watt)

 

 

You may be interested in these PDFs and links about fans (compiled and uploaded to MediaFire by me):

http://www.mediafire.com/?8uidb5xzgwwv4

 

Quote:
Originally Posted by Art Vanelay View Post
How much of a difference would there be in the performance of high RPM fans like the Deltas on very high FPI heat sinks or radiators?

The high RPM will definitely help overcome the pressure loss since New SP/Old SP = (New Speed/Old Speed)2.


Edited by nawon72 - 8/29/12 at 8:18am
post #145 of 780
Thread Starter 
Quote:
Originally Posted by nawon72 View Post


What does the Noise to Temperature Rating mean? (e.g. C*/W is Celsius per Watt)

You may be interested in these PDFs and links about fans (uploaded to MediaFire by me):
http://205.196.123.172/ficnqp8rjrzg/v4d66fn71ktbvdy/Fans.zip

To clarify, it's not a ratio, it's a rating. I simply add delta temperature to noise and then devide it by 10. It's just a way of showing how much a fan can cool relative to how much noise it produces. Obviously the lower the number, the better the fan performs in that criteria.

Thanks for the link, I'll take a look at it.
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post #146 of 780
Quote:
Originally Posted by Cyclops View Post

Quote:
Originally Posted by nawon72 View Post

What does the Noise to Temperature Rating mean? (e.g. C*/W is Celsius per Watt)
To clarify, it's not a ratio, it's a rating. I simply add delta temperature to noise and then devide it by 10. It's just a way of showing how much a fan can cool relative to how much noise it produces. Obviously the lower the number, the better the fan performs in that criteria.

OK, then how did you come up with the equation? dB is not not linear, and I don't understand how the number can mean anything if it doesn't have units unless it's a subjective, relative measurement, or ratio. headscratch.gif Ex. (40dB + 40*C)/10 = 8?, where are the units?. The units don't cancel like in this equation: New CFM/Old CFM = New RPM/Old RPM


Edited by nawon72 - 8/27/12 at 6:22am
post #147 of 780
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Quote:
Originally Posted by nawon72 View Post

OK, then how did you come up with the equation? dB is not not linear, and I don't understand how the number can mean anything if it doesn't have units unless it's a subjective, relative measurement, or ratio. headscratch.gif Ex. (40dB + 40*C)/10 = 8?, where are the units?. The units don't cancel like in this equation: New CFM/Old CFM = New RPM/Old RPM

Again, it's just a rating, not a ratio. It doesn't have a unit associated with it. I guess you could call it subjective. Read post #3 for more info.
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post #148 of 780
Quote:
Originally Posted by nawon72 View Post

The high RPM will definitely help overcome the pressure loss since New SP/Old SP = (New Speed/Old Speed)2.
I wanted to know more to what degree it would have an effect.
    
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post #149 of 780
Quote:
Originally Posted by Cyclops View Post

Again, it's just a rating, not a ratio. It doesn't have a unit associated with it. I guess you could call it subjective. Read post #3 for more info.

I only see:

Quote:
The chart that I'm going to make will include a simple yet intuitive Performance to Noise ratio section alongside other standard bits and bobs.

So I still don't understand how this rating is of any use. And it can't be subjective if you're using measured values such as the ΔT and dB (A weighted I'm assuming). I'm concerned people will use this rating to compare fans when it doesn't mean anything (from what I can see). It would be like making a price/performance comparison when the price is always changing due to sales, supply/demand, and where you are buying the product from.

 

Quote:
Originally Posted by Cyclops View Post

I will also be measuring the noise levels of each and every fan and maybe later, the voltage required to run these fans at full speed.

Are you going set the voltage to make the fan run at it's rated speed? Seems pointless to me. But maybe you meant to measure the starting voltage and RPM, and were thinking something else when you typed that.

 

 

Quote:
Originally Posted by Art Vanelay View Post

Quote:
Originally Posted by nawon72 View Post

The high RPM will definitely help overcome the pressure loss since New SP/Old SP = (New Speed/Old Speed)2.
I wanted to know more to what degree it would have an effect.

You would need to add the ventilation resistance into a PQ graph of the fan/s in question, similar to this (this is real world data though). On top of that you would want to add the dBA to Q (flow) curve for the fan/s. Then you can see which fan (in theory) will be the best choice. However, you usually can't directly compare fans specs from different manufactures since their testing methods are different. It would require a lot conversions to do a proper comparison (see this for more info on that).

 

But since most of the above info is not readily available (you could try sending an email), testing is the only way to know for sure.

post #150 of 780
Quote:
Originally Posted by Cyclops View Post

To clarify, it's not a ratio, it's a rating. I simply add delta temperature to noise and then devide it by 10. It's just a way of showing how much a fan can cool relative to how much noise it produces. Obviously the lower the number, the better the fan performs in that criteria.
Thanks for the link, I'll take a look at it.

So wait... (delta T + decibels)/10?

If a fan can cool more... (ie, higher delta T), then its rating goes up.
If a fan is loud... (ie, higher decibels), then its rating goes up.

Is a high rating desirable, or a low rating? A loud, high performance fan has a high rating. A soft, low performance fan has a low rating. A high performance, low noise fan has a moderate rating and a low performance, high noise fan has a moderate rating. I don't get how the current rating is useful for anything given that a high performance, low noise fan (the best kind) is rated the same as a low performance, high noise fan (the worst kind).

A low rating could be achieved by a 500 rpm 120mm fan.
A high rating can be achieved by a 5400 rpm 120mm fan.
Neither of the above are necessarily good fans...
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