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Which is more important? Intake or outtake. - Page 3

post #21 of 27
Quote:
Originally Posted by TELVM View Post

Warning: Spoiler! (Click to show)

^ Axial fans blow thru heatsink against GPU PCB, air then escapes outwards parallel to the GPU PCB plane in the West, North and East directions.

In the South direction the air collides with the mobo PCB and is just endlessly recirculated by the fans in a "short-circuit".
Good example! thumb.gif

What happens on south against motherboard also happens on north against side panel... some goes toward CPU but most goes down and back into fans.

East direction ends up going up toward CPU cooler intake with some of the north's.

Bottom, side and lower front intakes can often get cool air to GPU fans but doesn't solve the problem of the GPU's heat mixing with CPU intake. frown.gif

Sometimes top vent is close enough to the front of case to be used for intake air to CPU cooler...or use 3x 5.25 optical bays in front of CPU as an intake. Like Lian Li BZ-502
post #22 of 27
Back when I had a case with side panel fans, I used them as intakes, now I realize they should have been exhausts too. Don't have side panel fans anymore, but don't need them. I did temp tests in my Carbide 540 with the side panel on and off and there was absolutely no difference!

Lovely mesh case.
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post #23 of 27
Quote:
Originally Posted by doyll View Post

... What happens on south against motherboard also happens on north against side panel... some goes toward CPU but most goes down and back into fans ...

Not if you make sure that your heatsink and fans well overhang "the northern border" of the GPU PCB.

___


Quote:
Originally Posted by bhav View Post

Back when I had a case with side panel fans, I used them as intakes, now I realize they should have been exhausts too ...

Might be so, but an exhaust left panel fan might also starve the GPU fans of air, and/or disrupt for the worse the overall case flow.

Better test before deciding.
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post #24 of 27
Quote:
Originally Posted by TELVM View Post


Not if you make sure that your heatsink and fans well overhang "the northern border" of the GPU PCB. Warning: Spoiler! (Click to show)
___
.
Indeed. So they blow over "the wall". (Game of Thrones) biggrin.gif
Have had good results with fans mounted low on stock GPU coolers too.
thinking.gif Wonder how it would work if fans were pulling air from GPU and ducted out the side / back (PCI slots) so none of their heated exhaust was mixing with cool intake?

I know pulling air from downflow CPU coolers usually results in cooler CPU and motherboard too.
post #25 of 27
Quote:
Originally Posted by doyll View Post

... So they blow over "the wall". (Game of Thrones) biggrin.gif

"Imp Cooling™"? biggrin.gif

Quote:
Originally Posted by doyll View Post

... thinking.gif Wonder how it would work if fans were pulling air from GPU and ducted out the side / back (PCI slots) so none of their heated exhaust was mixing with cool intake? ...

Thought about that when I was fiddling with that ghetto GPU duct of mine but never really tested it. The idea has its own problems but would benefit CPU temps.

Worth testing in some case design where the PSU isn't blocking the direct exhaust path to a giraffed floor (nor ingesting the heated exhaust air from GPU).
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post #26 of 27
Quote:
Originally Posted by TELVM View Post

Worth testing in some case design where the PSU isn't blocking the direct exhaust path to a giraffed floor (nor ingesting the heated exhaust air from GPU).
thumbsupsmiley.png

thinking.gif PSU will probably function no problem with added intake air temp. Even a simple divider from floor to bottom of case just the width of case would probably block most of the heat coming out of duct from GPU to bottom... and if GPU is only PCI-E than other PCI slots could be used as exhaust vent as well as low side vent.

Hardest part would be building duct and still having cool intake air flowing over motherboard to bottom of GPU PCB and up into cooler. GPU PCI-E back vent may be problematic as well.
post #27 of 27
This intrepid OCN forumer also experimented on the subject: Custom 5 Euro Fan Duct

He didn't try pulling fans but the thread illustrates the problems inherent to a sharp 90 degree bend.

a4157d46_vbattach225463.jpeg

Edited by TELVM - 9/3/13 at 11:50am
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