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Difference between having GT's in Push vs Pull?

post #1 of 6
Thread Starter 
Is there much difference between having two Scythe GT 1850 in Push versus Pull?

The radiator is a 240, and it will be placed in bottom front. And there might be some cons having them in Push.
post #2 of 6
I'm not quite sure what you mean by Push OR Pull. Generally Push/Pull means that for each fan on one side of a radiator you also have on one the other side (in your case, 2 fans on one side going in the same direction, 2 on the other side also forcing air in the same direction). One fan pushes air into the radiator while the other fan pulls it out; both fans move air in the same direction. If you had the both pulling air out of the radiator or pushing air into the radiator, they would be very inefficient.

Having both fans pull air from inside the case and pushing out helps with airflow inside the case but will put air that is a few degrees hotter from the rest of the PC components through the radiator. Pulling air in from outside the case and passing it through the radiator first give your loop better temperatures but can cause a bit higher temps inside the case. Most people (from what I've observed) do the second option and have their fans suck air from the outside of the case and pass it directly through the radiator.
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post #3 of 6
Inlet vs exhaust aside, the difference will be slight. Have a read of Martin's fan orientation and shroud test, he tested both push, pull and push / pull with and without shrouds.

The results for 2k RPM 38mm fans looks like this:



So there is a 0.9°C difference between push and pull, pull being the worse.

Note that these results are for higher speed and fatter fans, for your setup it will be different.

Basically, you should get slightly better results in push vs pull, but it will be slight. Best thing to do is give it a try and see what works best for you.
Edited by GingerJohn - 6/9/11 at 3:37pm
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post #4 of 6
To follow on a bit from what GingerJohn said:

Slower fans tend to be better in pull, faster fans tend to be better in push.


1850 is about the halfway house where you will see almost no difference between the two configs.


I think you'd prob see a slight improvement with push. but imo, do whatever is easiest for you and fits your case config best.



That is to say, if you have a lot of intake fans, have the rad as an outlet, if you have a lot of outlet fans, have the rad as an intake.
    
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post #5 of 6
Push like a pregnant woman. That is all.
    
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post #6 of 6
Thread Starter 
Ok, I put them in pull, cause it makes everything much easier (and it wasn't easy to begin with )

But I can do push too, but that would with it drawing air from the inside of the case. How it is now, is that two 230mm fans are in push through a 420mm rad into the case(3x140, and the fans are not very efficient) and only a GT 1450 in exhaust. It's a Atcs 840 case, so there is places where air can escape.

If I gonna change fan directions, I think I should do that with the 230 fans.

The case is extremely modified to fit the radiators, how the pump is installed etc. And there is highly likely that there is more to come (like that I had to cut a hole in the floor of the case, so part of the radiator could be lowered into it )

I'm on the GT 2150 group buy list, paid and all
But that will take some time before I get them ofc

But the GT 1850, will they become more silent after some time of operation?
They have not been in use before, so that's why I'm wondering

Dremeling is helpful here
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