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Question about push-pull

post #1 of 11
Thread Starter 
I live in south Texas, so I need all the help I can get with air cooling. On a usual summer day, the ambient temperature in my house gets to around 29c. This leaves little headroom before I start hitting undesirable temps. I recently got a 4-pack of CoolerMaster 120mm fans, and I have a couple left over. Would it be alright to use one for the pull side on my Hyper 212 Evo? I'm not sure if the CFM/RPM have to be exactly the same on the push and pull sides, but the the fan on the CM 212 is 2000RPM and the ones I have are 1200RPM.

Any help is appreciated biggrin.gif
post #2 of 11
Quote:
Originally Posted by InaneAsylum View Post

I live in south Texas, so I need all the help I can get with air cooling. On a usual summer day, the ambient temperature in my house gets to around 29c. This leaves little headroom before I start hitting undesirable temps. I recently got a 4-pack of CoolerMaster 120mm fans, and I have a couple left over. Would it be alright to use one for the pull side on my Hyper 212 Evo? I'm not sure if the CFM/RPM have to be exactly the same on the push and pull sides, but the the fan on the CM 212 is 2000RPM and the ones I have are 1200RPM.
Any help is appreciated biggrin.gif

Hey bud... Welcome. Im from South Texas too. biggrin.gif

It has been warm.

More fans = better. Just use them wisely.

Try and direct the hot air out the back of your case in a direction...

Dont push and pull in every which way... Try a pattern of airflow and if more fans can add to that airflow... better.
Edited by iLeeT - 8/24/12 at 6:51pm
     
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post #3 of 11
Having a slower fan will only impede the performance of the faster fan and wear it down much more quickly. It will make your temperatures worse due to the high turbulence within the heatsink between the fans. Those fans differ too vastly in performance.
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post #4 of 11
Quote:
Originally Posted by InaneAsylum View Post

I live in south Texas, so I need all the help I can get with air cooling. On a usual summer day, the ambient temperature in my house gets to around 29c. This leaves little headroom before I start hitting undesirable temps. I recently got a 4-pack of CoolerMaster 120mm fans, and I have a couple left over. Would it be alright to use one for the pull side on my Hyper 212 Evo? I'm not sure if the CFM/RPM have to be exactly the same on the push and pull sides, but the the fan on the CM 212 is 2000RPM and the ones I have are 1200RPM.
Any help is appreciated biggrin.gif

If you're going to use different RPM fans in push pull, you should have the weaker fan pushing and the higher rpm fan pulling
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post #5 of 11
Quote:
Originally Posted by Forrester View Post

If you're going to use different RPM fans in push pull, you should have the weaker fan pushing and the higher rpm fan pulling

that's the exact opposite of what i would have recommended biggrin.gif
post #6 of 11
Quote:
Originally Posted by psyclum View Post

that's the exact opposite of what i would have recommended biggrin.gif

You only have two options, what's a non exact opposite? tongue.gif
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post #7 of 11
lol ignore my previous post, I read this data wrong
Quote:
Here's the abbreviations I'm using in this post:
-l = pull
-h = push
UK# = Ultra Kaze #000RPM
U1C = Panaflo U1C
SFx = S-Flex x (E,F,G)

So: Ultra Kaze 3000 in pull = UK3-l
S-Flex G in push - SFG-h

UK3-l = 97.4CFM (percentage improvement over single fan - 0%
UK3-h = 109.5CFM (0%)

U1C tests
UK3-l + U1C-h = 136.7CFM (28.8%)
U1C-l + UK3-h = 138.9CFM (21.2%)

UK2 tests
UK3-l + UK2-h = 112.7CFM (13.6%)
UK2-l + UK3-h = 123.9CFM (11.6%)

UK1 tests
UK3-l + UK1-h = 97.1CFM (-.3%)
UK1-l + UK3-h = 110.3CFM (.7%)

this data supports the higher rpm fan being in push while the lower rpm fan is in pull
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post #8 of 11
Quote:
Originally Posted by Cha0s_Cha0 View Post

You only have two options, what's a non exact opposite? tongue.gif

well.... technically, you have push only, pull only, both fans on push, both fans on pull, etc... tongue.gif there are alot of people doing strange things out there biggrin.gif
post #9 of 11
Thread Starter 
Wow...didn't expect so much of a response O.O

I have a pretty good airflow setup going and just added the side fans to get rid of the last hot pocket under my GPU. I didn't expect it to help my CPU temp much, but it made a few degrees difference. I'll go ahead just test it out and see if I get any results.

Thanks a bunch smile.gif
post #10 of 11
The worst that could realistically happen is that you get no benefit, but it's possible that you could drop a number of degrees C off the load temps. Perhaps try different configurations to see which yields the best temps?
   
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