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Top Exhuast vs Top Intake - Page 4

Poll Results: Which one is better?

 
  • 14% (21)
    Top Intake
  • 85% (127)
    Top Exhaust
148 Total Votes  
post #31 of 59
Quote:
Originally Posted by tw33k;14075607 
That's not correct. I've tried every possible scenario and this is what gives the best temps.
Also, it's not loud at all.

What are the side effects (temp on other MB components, GPU, drives et.c.) ?
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post #32 of 59
Quote:
Originally Posted by Vagrant Storm;14075447 
a top intake might make your CPU a degree or two cooler because it would feed ambient air near directly to your CPU heat sink...but it would also mean you are blowing all the CPU heat into all your other components.

Top exhaust...definately. No meager CPU temp drop is worth the consquensces.

The consequence is that the air pressure builds and flows out the back vent.

I have situated:

top induction: 2x NF-P12's
front induction: 2x NF-P12's
CPU: 2x NF-P14 FLX's
Side: NF-P12

I also found that the CPU was cooler and that there was no real adverse reaction to the fan set up.
post #33 of 59
for me intake saved me 10ºc. air goes where you push it-.
    
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post #34 of 59
Quote:
Originally Posted by noSleep;14099645 
What are the side effects (temp on other MB components, GPU, drives et.c.) ?

Everything's cooler
start_2.png
post #35 of 59
I was intrigued by this so I turned my fans the opposite way so top was intake and front exhaust. Dropped my CPU temps by 2 degrees. Great I thought. Except system, GPU and HDD temps went up by around 6 degrees. Not so great. I've turned them back to top exhaust and front intake.
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Alpha II
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post #36 of 59
Hot Air Rises.

I use the top fan as Exhaust for that one reason.
post #37 of 59
Quote:
Originally Posted by t0adphr0g;14101465 
Hot Air Rises.

I use the top fan as Exhaust for that one reason.

look:
http://www.silverstonetek.com/techtalk_cont.php?area=usa&tid=wh_positive
http://www.silverstonetek.com/techtalk_cont.php?area=usa&tid=wh_airflow

So, all the air rises, yes. But, if you have a back exhaust, then you can create a wind tunnel by forcing all the air into a stream that exits thru rear exhaust fan and passively through holes in the back and front of the PC: This brings benefits of positive pressure: less dust, less dead spots, less fans fighting for air.
If you are forcing craploads of air into the PC it has to exit somehow or it will explode (eventually, if your case has no ventilation holes xD) If you are taking craploads of air out of the case, you are also bringing air into your case thru the vent holes. kind of like a vacuum. See what I mean?
    
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post #38 of 59
Air goes where you push it. That's what case fans are for.

The old method for microcomputers in towers, back when dinosaurs roamed the earth, had as much to do with cooling motherboard components - chipsets and the like - as cooling the cpu and the gpu. Now we worry about cooling the latter, but when we let hot air rise, or encourage it with top exhaust fans, we allow air to be warmed by the motherboard's components and the gpu(s) before it rises up to the heatsink, where it compromises cooling.

Want an example? OK. Just ponder this: for most of you, your computer is cooler when the side panel is open than when it is closed. That is, I submit, because the hot air from the nether regions of your case spread out, and your heatsink has access to fresh air that has not been warmed by electronics.

Ideally you'd have a fan on your side panel at the top, just forward of your heatsink to feed it cool air. No having that, we have top exhaust. Most of us with cases less exalted than the HAF X have top fans much closer to the heatsink. We typically get a 3-5c improvement when we switch from top exhaust to top intake. You can augment this with an upper front intake (see item 10 in my sig).

You can get a wind tunnel effect by removing your rear grill and leaving off a rear fan. You can even create negative pressure this way - see item 2 in my sig.

When you switch from top exhaust to top intake and you see a rise in your gpu temps, it's time for a visit to your local hobby shop. They sell sheets of stiff plastic so model railroaders can make buildings and things. The stuff is perfect for dividing your case into zones, one for the cpu, one for the gpu's.

Depending on your front and bottom intake, or lack thereof, you can choose a side panel intake or side panel exhaust. I suspect that with adequate front and bottom intake you can make your side panel fan into an exhaust. That way the hot air your gpu's spew forward will have someplace to go (just think; do you really want that hot air going to your heatsink?). Normally I'm a big fan of natural exhaust, but when it comes to gpu's an active exhaust may be preferable. Just look at that thing on the back of a CM ATCS 840 - that has an extraction fan, of all things.

Anyway, there are plenty of ways to get creative. For example, if your case has a side grill with no provision for a fan you can Velcro a fan there (see item 6 in my sig). Just reflexively saying "hot air rises" means you haven't given your airflow much thought. Most things we do improve when we give them a lot of thought. Just ask the guy who figured out to make fire . . .
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secundus
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post #39 of 59
I have a Silver Arrow with the fans blowing towards the top of the case where I have 2X 230mm fans exhausting, along with the 140 mm at the rear of the case. 2 120's are in front of the hd bays, one 120 is behind the board in the door & 230's in the other side panel. Throw in the 140 in the PS & I have air FLOW. I run HIGH voltage & it stays between 27 & 78 or so at worst. 73 -75 is generally the max.
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post #40 of 59
I tried both setups with my 800D
intake worked better

^ my gpu wents down with intake setup
Edited by SirWaWa - 7/4/11 at 9:58pm
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