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Fans!!!! The most complete and comprehensive array of tests and benchmarks - Page 17

post #161 of 762
Thread Starter 
Quote:
Originally Posted by dhughesuk View Post

This is intense, I love it and kudos to the hard work gone into everything on here. From certain charts, and please correct me if I'm wrong, it looks like Push/Pull configurations have an indistiguishable gain and sometimes no gain at all at a very significant doubling of power. Push/Pull configs look good but I'm sure I've seen in other places that it does make a difference. If I am reading it right and your tests are showing that push/pull makes very little difference, could this be down to the setup of your test rig? can the nature of the rig affect this?
I really appreciaite the work gone into it though, my own testing is based on noise and how cheaply I can get the fans. Possibly a price/performance/noise score could be put together as well. Price is important if you have to pay smile.gif

Thanks. I've already said this before, but depening on when you buy it and where you buy it from, it will be a different number everytime so I can't make a chart on that.

As for push/pull not making a huge difference, it's not completely true. It's more noticable when you look at lower RPM fans that don't move alot of air. Those fans benefit quite a lot from a push/pull configuration.
Quote:
Originally Posted by Truedeal View Post

You should test the Delta Mega-fast 120mm fans.
Which supposedly run up to 7200 rpm and are rated at 252 cfm.
Might as well be a leaf-blower fan biggrin.gif.
Link: http://www.frozencpu.com/products/8147/fan-500/Delta_Mega_Fast_120mm_x_38mm_Fan_-_252_CFM_-_Bare_Lead_PFB1212UHE-F00.html

Yeah, I've already tested those fans and I'm in the process of finishing the review so expect one shortly.
Edited by Cyclops - 8/29/12 at 9:01am
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post #162 of 762
Quote:
Originally Posted by nawon72 View Post

Fans in series increases the static pressure, so it is most helpful when there is a lot of ventilating resistance. See this diagram. So yes, "the nature of the rig" can "affect this".

thank you very much! thumb.gif
Edited by dhughesuk - 8/29/12 at 9:17am
post #163 of 762
Quote:
Originally Posted by Cyclops View Post

As for push/pull not making a huge difference, it's not completely true. It's more noticable when you look at lower RPM fans that don't move alot of air. Those fans benefit quite a lot from a push/pull configuration.

Low RPM fans benefit from it more since static pressure decreases with the square of the RPM. See this fan law: New SP/Old SP = (New Speed/Old Speed)2

 

As you can see, halving the RPM will reduce the SP by 4 times.


Edited by nawon72 - 8/29/12 at 9:24am
post #164 of 762
Quote:
Originally Posted by Cyclops View Post

Thanks. I've already said this before, but depening on when you buy it and where you buy it from, it will be a different number everytime so I can't make a chart on that.
As for push/pull not making a huge difference, it's not completely true. It's more noticable when you look at lower RPM fans that don't move alot of air. Those fans benefit quite a lot from a push/pull configuration.
Yeah, I've already tested those fans and I'm in the process of finishing the review so expect one shortly.

ok that's good to know, apologies for not seeing that you'd said it before and fair enough yeah - maybe go on RRP though it's never accurate it's a ball park but ok and thanks.
post #165 of 762
Quote:
Originally Posted by nawon72 View Post

This is why:
Let's see what happens when we double the RPM of Fan B to match that of Fan A:
Quote:
doubling the RPM will increase the noise by 15dB
Quote:
N2 = N1 + 50 log10(RPM2 / RPM1)
Where: N = noise (dB)
Assuming speed and noise vary in proportion to the fifth power.

I missed that equation. If that is accurate, that would be a very good way of comparing fans.
    
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post #166 of 762
Thread Starter 
Noise to temperature results are re-uploaded to post #1. Silverstone FM121 and Noctua NF-P12 used to dominate that area. Now though, Zalman is butting in and Cooler Master isn't far behind. Cooler master fans are a bargain though. If you're short on cash, those are the ones to get.
Edited by Cyclops - 8/29/12 at 12:13pm
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post #167 of 762
Quote:
Originally Posted by Art Vanelay View Post

Quote:
Originally Posted by nawon72 View Post

This is why:
Let's see what happens when we double the RPM of Fan B to match that of Fan A:
Quote:
doubling the RPM will increase the noise by 15dB
Quote:
N2 = N1 + 50 log10(RPM2 / RPM1)
Where: N = noise (dB)
Assuming speed and noise vary in proportion to the fifth power.

I missed that equation. If that is accurate, that would be a very good way of comparing fans.

It is accurate, but there are more variables to account for when the fans are on a heat sink and in a case. However, you could use it to compare fans that had their specs measured with the same method, and don't have any noise issues at particular RPMs. Here are important factors to consider when comparing acoustical data.

 

Check out my "Information on Fans" sig link if you would like to know more.


Edited by nawon72 - 8/29/12 at 9:12pm
post #168 of 762
Quote:
Originally Posted by Cyclops View Post

Cooler master fans are a bargain though. If you're short on cash, those are the ones to get.

thumb.gif
post #169 of 762
Quote:
Originally Posted by nawon72 View Post


Check out my "Information on Fans" sig link if you would like to know more.

Amazing. Thanks. thumb.gif
post #170 of 762
[Redacted; I misread one post]

Good work guys. Ideally we could graph all the noise-to-temp curves for each fan varying along its RPMs. But of course this only applies to the specific setup used; a higher or lower impedance environment, or higher/lower ambient temp, could have variable impact on each fan and result in different shifts. In other words, the ranking established with this method is not necessarily invariable. Unfortunately, there is no physical ratio intrinsic to a fan that will result in truly invariable rankings of fan models for any arbitrary environment. But this method at least has strong predictive power for most generic setups.
Edited by Gabedamien - 8/31/12 at 2:38pm
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