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Corsair SP120 Quiet Edition vs Noctua NF-F12 - Page 2

post #11 of 47
Quote:
Originally Posted by INCREDIBLEHULK View Post

http://koolance.com/fan-120x25mm-108cfm
http://www.frozencpu.com/products/9780/fan-619/Cooler_Master_Blade_Master_120mm_x_25mm_PWM_Fan_R4-BMBS-20PK-R0.html
Howcome I never see anyone talk about these two fans smile.gif i tried to research and they "seem" to outperform all those in the graph cfm/static pressure wise?
Or am I missing something and one of you can fill me in biggrin.gif

They seem cool. I think I will stick with noctua though. I will get another 4 NF F12' for my new rad coming soon.
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post #12 of 47
Quote:
Originally Posted by BradleyW View Post

Can't you just use a fan controller?
BTW, I suggest the corsair SP120's. 0.5c behind the NF F12 rpm for rpm. Don't bother with airflow if you want to cool down a rad. It is all about static pressure. Check out linustechtips and review sites on static pressure round ups between bands of different fans. All is explained.

It depents on the FPI also, if the rad has a low fpi count then CFM is going to have a major impact. I am using Corsair SP silent @12v with a Nexxxos ST30 and found them to be adequate to say at least (my major concern is silence over performace thus no OC on the rig).
post #13 of 47
Quote:
Originally Posted by kanaks View Post

It depents on the FPI also, if the rad has a low fpi count then CFM is going to have a major impact. I am using Corsair SP silent @12v with a Nexxxos ST30 and found them to be adequate to say at least (my major concern is silence over performace thus no OC on the rig).

Even withwith low fpi, cfm will not contribute on a noticable level as all rads are somewhat restrictive. Static pressure is the only changing factor most of the time. And I repeat, most of the time, not all the time.
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post #14 of 47
Actually static pressure is a poor measure as well. The restriction of a radiator falls somewhere on the curve between the two points of max air flow and static pressure. The curvature of the PQ (Pressure vs Flow) curve is actually much more important than either of those two because some fans have a pronounced bump in the PQ while others are flat or dipped.

This is just one example of why you should NOT get too wrapped up in either max air flow or static pressure. If you really want to know fan throughput on a radiator you need the entire PQ curve. Manufacturers that are serious about real fan performance generally publish the full PQ curve so look for that and take notice of the "shape" in the middle. Static presuure means nothing in real world performance if you are splitting hairs, it is the pressure at "static" or "0" air flow and an indicator on tuning, but fails miserably at providing a means to really measure or estimate actual performance with any accuracy with the variability in PQ curvature. Ballpark tuning ok, but don't rely on it too much. PQ curve is what you need to fully understand fan performance. Noise of coarse is completely another story and similarly measured in an abstract way that means nothing once mounted to a radiator.

cougarvsgt15part4.png

It's too bad they don't come up with a restriction standard and simply report out "x radiator CFM and dBA". That would actually be something useful for radiator applications.
Edited by Martinm210 - 4/5/13 at 5:59am
    
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post #15 of 47
Just shows you that you are not to take much notice of what is said on the box.
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post #16 of 47
Thread Starter 
Quote:
Originally Posted by Martinm210 View Post

Actually static pressure is a poor measure as well. The restriction of a radiator falls somewhere on the curve between the two points of max air flow and static pressure. The curvature of the PQ (Pressure vs Flow) curve is actually much more important than either of those two because some fans have a pronounced bump in the PQ while others are flat or dipped.

This is just one example of why you should NOT get too wrapped up in either max air flow or static pressure. If you really want to know fan throughput on a radiator you need the entire PQ curve. Manufacturers that are serious about real fan performance generally publish the full PQ curve so look for that and take notice of the "shape" in the middle. Static presuure means nothing in real world performance if you are splitting hairs, it is the pressure at "static" or "0" air flow and an indicator on tuning, but fails miserably at providing a means to really measure or estimate actual performance with any accuracy with the variability in PQ curvature. Ballpark tuning ok, but don't rely on it too much. PQ curve is what you need to fully understand fan performance. Noise of coarse is completely another story and similarly measured in an abstract way that means nothing once mounted to a radiator.

cougarvsgt15part4.png

It's too bad they don't come up with a restriction standard and simply report out "x radiator CFM and dBA". That would actually be something useful for radiator applications.

Thanks Martin, that was insightful. So based on your experience, regarding noise vs Performance, for a thick 38mm rad, which fan do you prefer between the corsair SP120's quiet Edition, the gentle typhoons or the Noctua NF-F12 PWM? In push or push-pull?

Cheers
post #17 of 47
Quote:
Originally Posted by Paps.pt View Post

Thanks Martin, that was insightful. So based on your experience, regarding noise vs Performance, for a thick 38mm rad, which fan do you prefer between the corsair SP120's quiet Edition, the gentle typhoons or the Noctua NF-F12 PWM? In push or push-pull?

Cheers

NF F12.
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post #18 of 47
Quote:
Originally Posted by Paps.pt View Post

Thanks Martin, that was insightful. So based on your experience, regarding noise vs Performance, for a thick 38mm rad, which fan do you prefer between the corsair SP120's quiet Edition, the gentle typhoons or the Noctua NF-F12 PWM? In push or push-pull?

Cheers

I have not tested the SP120 retail box, but I wasn't too impressed with the H100i fans which spin up to 2700RPM. They were rather cranky at slow speeds.

I did however test the NF-P12 vs the GT AP-15 on my MCR120 radiator test rig
fantestr10-01.jpg?w=614&h=386
and this was the result:

round10fantestresults.png?w=614

The AP-15 not only produced more air through a radiator (760FPM vs 610FPM noctua) [24% more air flow], it did so at about 7-8 dBA quieter than the NF-F12. No comparison really.

Perhaps my NF-F12 was just a poor sample, but it was only a loaner and I no longer have it to do more testing. I may buy another to figure out why everyone keeps recommending them, but the one I tried wasn't anything special when it comes to radiator use. The GT is better by a LARGE margin.

The only bad thing about the GTs is the lack of PWM control and they do tend to have certain harmonics issues as specific RPM (as you can see with the "Bump" in the result) so not really the best fan to throttle speeds up and down variable. Great fan to fix a constant speed though, nothing comes close.
Edited by Martinm210 - 4/5/13 at 9:03pm
    
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post #19 of 47
Apparently the L versions of the SP and AF fans are reduced cost versions of the Air series fans. The AF120L that comes with new corsair cases is a much reduced cost version with sleeve bearings for example.
I'm not sure how different the construction of the SP120L is to the retail SP's though.

I don't know what to believe about fans, especially on rads. I have read so much directly contradictory testing on airflow through radiators that it does my head in.
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post #20 of 47
Sometimes you just have to dive in and see what the results are. The color rings on the Corsair fans are great for aesthetics. Just buy em and throw them on. If it works out on temps you're a winner. thumb.gif
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