Noctua A12x25 vs F12 for case intake, which is better? - Overclock.net - An Overclocking Community

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Noctua A12x25 vs F12 for case intake, which is better?

 
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post #1 of 6 (permalink) Old 10-22-2019, 11:03 PM - Thread Starter
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Noctua A12x25 vs F12 for case intake, which is better?

According to this video, it seems that A12x25 diffuses airflow very aggressively.

Does that impact case airflow path?

If it does, perhaps Noctua F12 is better suited for case intake due to its stator vanes which straighten the airflow? 


Last edited by XtrathiccFan; 10-22-2019 at 11:50 PM.
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post #2 of 6 (permalink) Old 10-23-2019, 06:41 AM
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Quote: Originally Posted by XtrathiccFan View Post
According to this video, it seems that A12x25 diffuses airflow very aggressively.

Does that impact case airflow path?

If it does, perhaps Noctua F12 is better suited for case intake due to its stator vanes which straighten the airflow?

https://www.youtube.com/watch?v=2yFFD-VWd1U
Vid only shows no air straightener added to fan cools better than when one is added. Just because he used NF-A12x25 has almost no meaning without same test being done with other 120mm fans .. like PH-F120MP, Gentle Tyhoon, etc.
I don't think fans' diffuxion of air hinders case airflow, but it depends on how case airflow is working. I've found the best case airflow in typical tower cases is front to back with as little turbulence as possible. Smooth front to back flow is key. Removing PCIe slot covers (even if vented) increases rear vent area and thus gives us better front to back airflow than with single vent behind CPU cooler .. so much more front to back airflow around GPU instead of only CPU.

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post #3 of 6 (permalink) Old 10-23-2019, 06:52 AM
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F12 is best suited as an intake for radiators or passive coolers, due its high static pressure.

I used 3x P12 as intake fans,, F12 mounted directly on CPU cooler as intake, then A12x25 as an outtake fan on CPU cooler and the very last outtake fans is noctua S12 due highest aiflow.

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post #4 of 6 (permalink) Old 10-23-2019, 07:01 AM
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Quote: Originally Posted by Offler View Post
F12 is best suited as an intake for radiators or passive coolers, due its high static pressure.

I used 3x P12 as intake fans,, F12 mounted directly on CPU cooler as intake, then A12x25 as an outtake fan on CPU cooler and the very last outtake fans is noctua S12 due highest aiflow.
That same higher static pressure rating makes it an as good or better case intake fan .. because most quality cases not only have more restrictived grills than cooler have, but also filters that add even more airflow restiction .. end result is case intakes have more resistance to airflow and any other computer application so higher pressure fans work much better. Especially at lower speeds because the lower the fan speed, the lower it's pressure rating / ability to overcome airflow resistance of filter and grill.

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post #5 of 6 (permalink) Old 10-23-2019, 07:32 AM
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Quote: Originally Posted by doyll View Post
That same higher static pressure rating makes it an as good or better case intake fan .. because most quality cases not only have more restrictived grills than cooler have, but also filters that add even more airflow restiction .. end result is case intakes have more resistance to airflow and any other computer application so higher pressure fans work much better. Especially at lower speeds because the lower the fan speed, the lower it's pressure rating / ability to overcome airflow resistance of filter and grill.
That is true of F12, but the "condensed" flow of air is perfect position for radiator/passive part of cooler.

Thats why i ended up with A12 as a case exhaust - there is little to no obstacles

I used P12 as case intake fans as they have quite high static pressure all the time, but the flow does not need to be so condensed. 3 such intake fans, even when obstructed with grills, dust filters and covers should deliver enough air for the rest of the system.

A12x25 ended up as an exhaust from CPU cooler, exaclty because it scatters air all around - some of my older systems had VRM overheated because there was no air flow around.

The result looks like this:
http://slayershrine.wz.cz/zoom.jpg
http://slayershrine.wz.cz/top.jpg

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post #6 of 6 (permalink) Old 10-23-2019, 07:41 AM
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Quote: Originally Posted by Offler View Post
That is true of F12, but the "condensed" flow of air is perfect position for radiator/passive part of cooler.

Thats why i ended up with A12 as a case exhaust - there is little to no obstacles

I used P12 as case intake fans as they have quite high static pressure all the time, but the flow does not need to be so condensed. 3 such intake fans, even when obstructed with grills, dust filters and covers should deliver enough air for the rest of the system.

A12x25 ended up as an exhaust from CPU cooler, exaclty because it scatters air all around - some of my older systems had VRM overheated because there was no air flow around.

The result looks like this:
http://slayershrine.wz.cz/zoom.jpg
Indeed, but it depends on what fans are being used on system coolers. If you have 3x 120mm intakes (about the same airflow as 2x 140mm) with 140mm fan on CPU cooler and 2-3x 80/90mm fans on GPU the intake fans will have to be running quite high speed to supply as much air as component coolers are using at lower speed. Hope that makes sense.

I remember old Intel i7 9xx series had similar issues, at least mine did.

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