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Noctuas on a Black Ice stealth, high fin density rad

post #1 of 28
Thread Starter 
I have a black ice stealth 240 rad and a black ice stealth gts lite 120 rad and I'm wanting to mount them in a sort of rad/fan sandwich like this:



Instead of the fans i have there I'm going to be using Noctua nf-p12 fans. My question is about the fin density of the two rads which you can see below:



Will these fans push enough air through the rads? I'm not looking to max out the performance of the rads but i would like to know if the rads are just not going to work at all with these fans and/or in the sandwich config.

More info:
They will be mounted in the front of the case vertically as an intake with the 240/fan/120 sandwich part being at the top and the 240 being first at the front of the case.
Edited by Aidan - 3/11/11 at 6:53am
Blanc
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post #2 of 28
Honestly I wouldn't try it.
Noctuas move way too little air for my taste.
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post #3 of 28
Skinnee did testing on the Swiftech stack of two 360 rads and showed that it had terrible performance. Once the air passes through the first rad it has absorbed enough heat that it can't really absorb anymore heat from the second rad. You should look at mounting them as single rads not in a sandwich.
post #4 of 28
Thread Starter 
There will be another 120 rad in the loop intaking from the rear too and an overclocked i7 and gtx580 are what's being cooled. Do you reckon with that 240/120 setup and another 120, all using noctuas will get ok temps?

Also if i put another fan after the sandwich on the inside so its 240>fan>120>fan will the airflow be improved enough to get the heat transfer up a bit?
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post #5 of 28
This will not work well, at all. You may get worse temps than if you left off the 120mm rad entirely.

You need a much stronger (thicker) fan + shrouds between the two rads to get decent results.
post #6 of 28
Thread Starter 
Here's a really rough drawing of my loop



The rad sandwich idea came from wanting the tubing to the CPU be a lot shorter and more direct and cleaner looking.

If i took out the 120 from the sandwich and just had a 120 in the rear and a 240 up front will my temps be better or worse?
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post #7 of 28
Quote:
Originally Posted by Aidan View Post
If i took out the 120 from the sandwich and just had a 120 in the rear and a 240 up front will my temps be better or worse?
In that case, better. The issue with the sandwich is not so much the warmer air going in the second rad (though that's part of it), but the massive restriction from the two high-FPI rads. Fans like those Noctuas just don't have the static pressure to overcome it.
post #8 of 28
Thread Starter 
So you're saying the added restriction of the additional 120 would affect how much air gets through the 240 aswell?
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post #9 of 28
Your drawing shows 2 120's and a 240 without your sandwich. 420mm of rads should be more than enough to cool your set up. I would leave that extra 120 out or mount it in the top or on the back. You could even use 2 of the 120's where that 240 is and move the 240 to hang off the back.
post #10 of 28
Quote:
Originally Posted by Aidan View Post
So you're saying the added restriction of the additional 120 would affect how much air gets through the 240 aswell?
Yes
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