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do both fans need to be the same in push pull? - Page 2

post #11 of 14
I would say they need to be the same as the speed differance and the fan differeance could create not enough Static pressure to cool the rad , Could do more harm than good to be honest
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post #12 of 14
Speed difference is not relevant, it's the CFM rating which should be as close as possible. If the difference is great, then one fan is just sitting there being pushed round by the other one. The ideal way to keep things sane is to buy 2 of the same model of fan, but ones with similar specs will also be fine. If they differ in static pressure, put the higher one on push, as the pull fan will then have an easier time pulling the higher pressure air out of the rad.
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post #13 of 14
Martin is correct (as usual).

I have different speed fans running at the moment with the higher speed ones pulling (1900 RPM vs 1300 RPM) My temps drop ~2c when both sets of fans are running over either push or pull. Basically the push fans smooths the air and pre-loads the rad space for the pull fan to exhaust the air. In this way it balances the air pressure on both sides of the rad. As Martin said, if you have a huge delta in power it will basically negate the value of the low power one.
post #14 of 14
Quote:
Originally Posted by Martinm210 View Post
NO...They don't have to be exactly the same on a radiator, just get them close if you can.

Fans work like pumps, they are spinning their wheels so to speak against the air so a little mismatch is not going to hurt anything. The fan is capable of 70CFM in open air, yet under restriction it's only pushing 30CFM, If you add another fan in sereies capable of 60CFM and the combined output is still only 40CFM. Each fan could care less if they are matched or not as they are both operating well within their limits. You probably just want to avoid a huge mismatch (150CFM Delta and a 30CFM on very low restriction, etc.)

I've heard some people say otherwise, but I have yet to see any scientific test. Another one of many forum created myths... From what I understand about pumps and fans, this is false.


I have seen several examples of operating similar but different pumps like a D5 + DDC, etc without any problems.

Air is very flexible and compressible...should be no problem mixing fans if they are roughly similar when operating against restriction like a radiator.

+1 on the P12s, they will be a step back in performance on the radiator vs the corsair.

Zalman F3 plus High Speed yates would be close enough I think.
+rep, I am a by the numbers guy. I hate to see the insistence that myths are true without examples.
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