Tom's Hardware > Forum > Overclocking > Heatsinks & Air Cooling > Push Pull, Push Push or Pull Pull?

Push Pull, Push Push or Pull Pull?

Forum Overclocking : Heatsinks & Air Cooling Push Pull, Push Push or Pull Pull?

AMD

Overclocking an I5 2500 to 4.4 What fan config is most effective?

I'm using a Cooler Master Hyper 212 Plus with the Y cable below.

http://www.newegg.com/Product/Prod [...] 6812718001

Message edited by Hardwired1979 on 05-10-2011 at 03:53:39 PM

Reply to Hardwired1979

Push-pull. You want both fans working together, not fighting each other. Aim the airflow at the back of the case.

Reply to jsc

Thats what I figured, thanks!

Reply to Hardwired1979

jsc wrote :

Push-pull. You want both fans working together, not fighting each other. Aim the airflow at the back of the case.

Affirmative!

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Reply to 4Ryan6

I have an i3 530 @4.3ghz same cooler with dual fans. Damn this thing is cold when I cut off the heat to my room in the winter lol

Reply to iduhfuse

Hey Yeah, push pull def... I aim airflow out back by duct taping some 4inch plastic dryer venting, incoming air also goes through a piece of venting from two modified drive bay covers to the front of the cooler. I also changed to using two 140mm fans. Have fun with it! I also use 2 other input fans and two output fans for case cooling. Ice that puppy down...

Reply to funguseater

what is push pull effect anyways?

i have a h100 cooler
is push pull having set bottom fans to blow up direction while the top fans are blowing in?

isnt that a conflict of air flow?

Reply to evilgummybear

^Fan at one side is pushing air through the heatsink, the other fan pulls air out of the other side of the heatsink. Imagine these ">>>>" are direction of airflow

>>>>fan(push)>>>>heatsink>>>>fan(pull)>>>>

Message edited by iam2thecrowe on 10-14-2011 at 03:42:13 AM

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Reply to iam2thecrowe

Ahh, so push pull is all in one direction flow of the are.

here i thought it was something like this (air flow direction) --> <--- (Air flow direction) causing conflict in flow lol.
silly me

Reply to evilgummybear

As hunter's tagline says,
The only stupid question is the one you didn't ask :-)
Moto

------------------------------ Once you start watercooling, you are almost automatically inducted into the modding circles as well, because theres rarely a 'from the box, fits everyone' solution, its your ingenuity and resourcefulness that makes it all happen,
Reply to Motopsychojdn

my main question is, is push pull really effective on corsair h100?
i mean i have a coolermaster hafx case. The top has a fan that is set to exhast air. My h100 already has 2x fans that is flowing at the same direct. The case fan is failry close to the cooler anyways. will push pull really effect the cooling that much?
i really dont see it worth the effet. Might help 1-2 degress perhaps?

Reply to evilgummybear

Do you guys ever try push / push. Saying they "fight" each other doesn't ring true to me. If the mass flowrate increases, the temps will be lower (in Q=mc delta t, if m increases, delta t decreases). The air will blow out the sides of the cooler and flow in thru the front and back. This might create some compensating factors (such as portions of the heat exchanger not receiving airflow) but those exist in the dead spot of the fan in Push or Push Pull anyway. The only other thing that would make me think push pull could be more efficient and effective than push push (or pull pull) is if the fluid resistance of the smaller sides is far below that of the front and back. I would think this would only become a factor with extremely high cfm thru the cooler.

So I guess my question is:

Has anyone actually tested this? Writing it off before trying it is kind of silly. Those compensating factors might be more of an impact, but without using computational fluid dynamics software (like what I use at work), testing is the only real way to know.

I think that especially at lower RPMs the push push would excel. So for those looking to do hyper efficient and quiet computing it might work well.

Reply to alansdaman

FYI I started another thread with most of what I just said and some more. It's labeled "CPU Cooling push push thermodynamics and heat transfer"

Reply to alansdaman

def a push pull out the back of the case

Reply to robthatguyx

I'm not asking a question from the "guy who knows nothing" point of view, I am asking it from a "guy who designs data centers and knows a great deal about airflow and cooling and also formerly operated nuclear reactors so has an in depth understanding of heat transfer and fluid flow" point of view. I am asking for someone who has tried to to either confirm or discredit. If you haven't tried it, don't write it off. I have one coming in the mail (a cooler master 212 plus). I am going to order another fan and try it at some point in the future, but for now I am attaching it to an OEM computer with no overclocking. I want to see how the theory scales.

Reply to alansdaman

Also, anyone knowing about pump / fan laws could help me out here. If we assume a single speed device, a given flow resistance, adding 2 pumps (fans) in series will do little to increase flow rate (the increase in head will overcome more of the resistance) but with 2 pumps working in parallel (push push) at a higher fluid resistance (since the surface area of the sides is lower in the 212+ I reference by about 25% so 25% more resistance) I think that will generate more CFM => more cooling. BUT if pressure in the heat exchanger volume is rapidly increasing with increases in fan hp, then the increase in flow would be minimal (as it is limited by the flow resistance of the opening and the plate). ie it approaches a max flowrate.

If you don't know what Q=MC delta T is, than I am not talking to you (unless you have experimented with this configuration, in which case I would LOVE to hear your results and the scenario they came from).

Message edited by alansdaman on 01-20-2012 at 05:25:34 AM

Reply to alansdaman