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26 120mm fans compared - Page 2

post #11 of 18
Thread Starter 
The nice thing about the charts is that the cfm shown is the cfm after mounting to a radiator. The original link shows cfm in an open air condition as well, so this is a true how much air is pushing through a rad vs how much noise.

So it is taking into account pressure, the noctua fans for example have pretty good air flow and quiet in open air, but once they are up against a radiator or some restriction, the small blades just don't have much pressure. A similar result in the TT silent wheel, the open air sides design just doesn't have much pressure so the resulting airflow vs sound is way down once mounted.

The original link does also note some things not shown on the graphs such as clicking or humming noises from some fans and how some fans undervolt better than others. In the end I thought it was one of the best comparisons I've seen with soo much data.
    
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post #12 of 18
lol, silenX fans wouldn't even be on the first chart hahah
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post #13 of 18
Thread Starter 
I've been wanting to try out a silenx fan as well, but I'm not sure I belive the rated specs.

The notua fan for example is rated at 47cfm and 17db, yet according to this test against a radiator it only get 25cfm at 28db.

I have some TT thunderblades that are rated for 78cfm /21db, but my yate loons are much quieter at a rated 28db. Seems like everyong is using different testing methods and I don't trust any of them for more than a ballpark figure.
    
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post #14 of 18
Kind of interesting....I wonder why he measured it in DB...I would really like to see a comparison in inches or MM of h20 pulled with a group of the top fans...Thats how a fans pressure is measured...
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post #15 of 18
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Yeah, and there is probably some difference depending on the type of radiator. Something with more fin density would favor fans that produce higher pressure even more.

But in the end the results are fairly bottom line, the heat exchange in the radiator assuming all radiators were the same would depend on how much volume passes through it. He was measuring actual volume that passes through so fans with low pressure had to spin up to get the same amount of air through resulting in more noise.

I just wish he had included a few more of the more popular rad fans, particularly 38mm. It would make sense to me that the extra depth provides better pressure, and fans with larger blades (Smaller gaps) would also produce better pressure and loose less capacity in a radiator condition.

On the other hand some of the radiators are really not very restrictive. In this test he used an MCR120 which is not very restrictive at least my 320 seems really open, so it would probably be a bit different with something with greater fin density or if a rad is internally mounted and the fans are also pulling internal case pressures.

In the end alot will probably depend on the radiator used, but it's a good baseline for the MCR120. I always kind of wondered how different fan blade designs work against a restriction like a radiator.
    
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post #16 of 18
Yeah the 38's have better pressure...Its easy to find spec's for Sunon and Panaflo but the others not I've not looked for the Pabst spec's they may be easy to find to.....Yeah I mean that is kind of interesting but its more then just a little round-a-bout...I just couldn't put much faith in it but its better then nothing for some of the fans I guess...We don't have any idea how good his control over it all was...
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post #17 of 18
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Yeah it would be awesome to see a similar run with even more fans on Tom's Hardware.
    
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post #18 of 18
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And I think I understand what you're saying about pressure/scavaging. I finally read through that entire thread and heard more about it. Apparently the guy was also testing CPU temp on a TT BT and the heat removed didn't necessarily line up perfectly with the flow rate of the radiator test.

It must also have something to do with the turbulence of the air that runs over the radiator fins.

Anyhow I'm broke for the time being and I'll enjoy my loons until I can try some 38mm fans out. In the mean time I should focus on building those shrouds that I know will help regardless of the fan used.
    
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