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SinththeSphinx

Doubling up on AIO fans?

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Posted · Original PosterOP

Hello! I just upgraded my cpu from a 3700x to a 3900x.  I have a kraken x72 aio on my system.  I was wondering if there would be any measurable benefit of putting fans both on top and under neath the radiator?  There are mounting points on both sides of the radiator, and I was curious if there would be any difference getting 3 more fands and doing a push – push or push – pull setup on the radiator.  My idea behind this was that if I keep the air moving through the radiator faster, the greater volume of air would absorb more heat to cool down the coolant. I was wondering if any one had tried this and noticed anything!

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Welcome to the forum!

10 minutes ago, SinththeSphinx said:

I was wondering if there would be any measurable benefit of putting fans both on top and under neath the radiator?  There are mounting points on both sides of the radiator, and I was curious if there would be any difference getting 3 more fands and doing a push – push or push – pull setup on the radiator. 

Depending on the case and setup it can make a decent difference. In my use case I was able to lower CPU temps and fan RPM in a push-pull config. The biggest concern is making sure you have the space in your case. Not necessarily worth the $$ investment of 3x more fans, as you will want to make sure they are the same fans you already have/ get a whole new set of 6 identical fans.

 

Really up to you. Does it yield a good cash to performance yield? No. Is it required for your use case? No. Will it lower temps, most likely yes (within 4-8 degrees under load).


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Instead of doubling the fans, make sure fans mounted on radiator have sealed edges/corners. Use square fans that are snug against the radiator frame. If fans are those fancy anti-vibration ones with cut out corners and lifted rubber, they'll leak pressure. Or suction, depending whether they are push or pull. I had to cut out thin layer of plastic that I placed between radiator and fan which seals these corner gaps on my SilentWings 3. It's basically plastic the size of radiator opening and with hole cut into it, to fit the fan opening perfectly. So air can only pass through the fan blades and through the radiator fins and not bleede out on the sides of the fan before it can even push it through radiator fins.

 

You can simply use packaging plastic. Motherboards usually have large clear plastic cover inside the box. Fan packages often have plastic blister that's slightly larger than fan itself which can also be used for such purpose. Plastic is super thin, but still rigid enough and can easily be cut with scissors or any kind of sharp blade like modeling knives/scalpels. Drill or punch holes in corners for screws to pas through and sandwich it between fan and radiator. Also don't be scared if fans lose some RPM because of that as they'll be working a bit harder, but won't be leaking any air pressure.

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13 hours ago, TheDailyProcrastinator said:

Really up to you. Does it yield a good cash to performance yield? No. Is it required for your use case? No. Will it lower temps, most likely yes (within 4-8 degrees under load).

Most of the tests I see yield 2-3C improvement with push-pull.

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If you have the space and the extra fans at your disposal then yeah, give it a try. Wouldn't expect a drastic change in performance though. Might not be worth the investment if you were expecting some huge drop in temps. 

 

As a side note, I don't think push-push would be a good idea period. 

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