Push Pull Heatsink Fan Setup

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amacher2772

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May 19, 2013
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Hello,

Is it alright to use two different fan types on my heatsink to achieve the puch pull method? Or do they both have to be the same exact fan to avoid issues?

Here is my heatsink
http://www.newegg.com/Product/Product.aspx?Item=N82E16835214023

Here is the second fan I just bought.

http://www.newegg.com/Product/Product.aspx?Item=N82E16835214030



They are both enermax fans that are 120mm in size. But my new one doesn't have a range of fan speeds. It just says 1200 rpm. Does this mean it will constantly run at that? The fan that comes with the heatsink has a range of 800-1800 rpm. IT averages 800 rpm most of the time.


Now I already bought this fan but not for the reason I am asking you guys about. I initially bought it for an empty fan slot in my case but then I just found out about this push pull thing. SO would it be alright to use two fans with different rpm ranges or would that create air flow issues if one decided to speed up faster than the other/ or slower than the other.

Thanks!
 
Solution
Tradesman1
I think same speed would be preferable, and haven't iused one of these heat sinks, but I'd give it a try, use stronger fan to push air in and slower pull it out the back won't be able to pull as much as is being pushed in but should still increase the airflow which theoretically should help cooling - let us know how it goes record temps as is then while trying to see if temps run lower
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Tradesman1

Tradesman1

Legenda in Aeternum
Jun 5, 2013
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I think same speed would be preferable, and haven't iused one of these heat sinks, but I'd give it a try, use stronger fan to push air in and slower pull it out the back won't be able to pull as much as is being pushed in but should still increase the airflow which theoretically should help cooling - let us know how it goes record temps as is then while trying to see if temps run lower
 
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Solution
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amacher2772

Honorable
May 19, 2013
60
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10,630
Idle temps
1 fan = 25 degrees C
2 fans = 21-23 degrees C

Max load 100%
1 fan = 49-52 degrees C
2 fans = 45-47 degrees C

I put the fan with the stronger push first. Around 900 rpm at idle and the pull fan is around 800 rpm. I forgot to look the rpm rates up at max load. Sorry about that. Anyway it is a slight improvement! So it does work just like you say it should theoretically :)

Since both fans are Enermax, I called them for their opinion about this. They said it should be fine without worrying about having issues. They told me that it will be a slight performance hit on the temperatures though. They said the temperature would come down even lower if you had the same exact fan. But they also said it wouldn't be that much better so it isn't 100% necessary.

I hope that helps! Let me know if you want to know anything else! Have a good one.

 
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