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Which side of a horizontal 240mm radiator is best for cooling fans?

post #1 of 11
Thread Starter 
1) Case roof --> Radiator --> Fans = air blowing up through the radiator and out the case (negative pressure design?)
...or...
2) Case roof --> Fans --> Radiator = air blowing down through the radiator into the middle of the case (positive pressure design?)

?

Actually one reason I'd like #2 if it's not so much of a bad idea, is the top of my case has metal tabs/flaps which make a hole for the plastic filtered vent to clip onto, this means I can't sit a radiator flat against the case roof (see 2nd picture below). Choices are hammer them flat (and risk the paint flaking off), rubber grommets to distance the radiator, or put the fans in first (#2 above), then radiator.

560

462

(Case pictures are of a SilverStone TJ04-E, in-case anyone wondered. The 2nd picture is the case upside down, showing the USB cables from the top of the case, and the metal flaps preventing a radiator from being mounted flush against the top panel.)
Edited by aln688 - 3/28/12 at 1:11am
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post #2 of 11
Either way you will see similar temps. That said though, with number 2 you would probably have more air turbulence inside the case which could enhance the cooling of some of your components.

But why couldn't you just have the fans pulling air through the radiator, so they would still be on top, like a combination of 1 and 2?
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post #3 of 11
Thread Starter 
Quote:
Originally Posted by DirektEffekt View Post

Either way you will see similar temps. That said though, with number 2 you would probably have more air turbulence inside the case which could enhance the cooling of some of your components.
But why couldn't you just have the fans pulling air through the radiator, so they would still be on top, like a combination of 1 and 2?

I was thinking with #2 more [hot] air could make it into the case, maybe not so good. So you mean option #1 but reverse the fans to point down into the case? I could do. I was hoping #2 would be a viable option, then I wouldn't need four of those little rubber grommets (you can see one in the 2nd picture) to lift the rad off the case roof avoiding those metal flaps.
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post #4 of 11
Actually, I meant more like number 2 but with the fans reversed so you're venting the air and you would still have the fans on top!
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post #5 of 11
Number 2 in push would give you the best temps overall. Push with radiators typically gives better temps and drawing cooler air in from outside ensures the radiator gets the coolest air possible.
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post #6 of 11
Number 2, fans above or below.
Fans above may give slightly better CPU temp as superericia said, fans below would give better airflow over mobo itself.
Also I always aim for a positive pressure configuration, to help keep dust out of the case.
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by DirektEffekt View Post

Actually, I meant more like number 2 but with the fans reversed so you're venting the air and you would still have the fans on top!

Ah I see, good idea. Would a "pull" setup be preferable to "push" for a radiator?
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post #8 of 11
Quote:
Originally Posted by aln688 View Post

Ah I see, good idea. Would a "pull" setup be preferable to "push" for a radiator?

Either way it's not really going to make much difference. I've seen testing that shows Pull being better and some that shows push, I think it all comes down to the fan. But you really won't see a difference either way unless you were actually testing for it under controlled conditions. I'm certain that you'll be happy with it either way!
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post #9 of 11
Thread Starter 
Quote:
Originally Posted by DirektEffekt View Post

Either way it's not really going to make much difference. I've seen testing that shows Pull being better and some that shows push, I think it all comes down to the fan. But you really won't see a difference either way unless you were actually testing for it under controlled conditions. I'm certain that you'll be happy with it either way!

Sounds good, thanks. I'll either be using Noctua NF-F12s, or NoiseBlocker M12-P 2000 RPM fans. I'm also checking into a thinner radiator so I can setup in push *and* pull, but if the radiator + fans hangs over my board too much, I'll axe that idea.
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post #10 of 11
Quote:
Originally Posted by aln688 View Post

Sounds good, thanks. I'll either be using Noctua NF-F12s, or NoiseBlocker M12-P 2000 RPM fans. I'm also checking into a thinner radiator so I can setup in push *and* pull, but if the radiator + fans hangs over my board too much, I'll axe that idea.

Don't go for a thinner radiator just to go push/pull. A thicker radiator will normally perform better with just pull or push than a thinner one with with both! Push/Pull is normally a 1 or 2 degree thing. The radiator will make much more difference though. Especially if you want low noise! I low-restriction, thick, radiator will serve you much better!
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