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is there an ideal proportion for case fans?

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Anonymous   02-02-2002 at 05:24:18 AM

On an ATX full tower, should there necessarily be more intake fans than output, more output than intake, or an equal amount? Does it really matter?

the layman

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svol   02-02-2002 at 10:59:35 AM
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In my opinion it doesn't really matters, I would say a equal amount is best. But it is more important that you give the fans a good place that they don't interfere with eachother (ie. when one fan is blowing air in an another fan is blowing that air out immediatly).

My case has so many fans that it hovers above the ground :eek: .

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Flyboy   02-02-2002 at 11:27:03 AM
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Equal amount is obviously ideal, but not really necessary. People have debated about positive vs. negative pressure inside the case.

One Arguments is:
1. Positive pressure reduces amount of dust accumulation in case. (I really doubt this though)

Just be smart about what and where your fans go and that's all ya' need to worry about. Most people agree that intake in the lower front side and exhaust in the back (preferably near the CPU) is good enough.

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pat   02-02-2002 at 03:48:51 PM
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in reply to:
-------------------------------------------------------------
1. Positive pressure reduces amount of dust accumulation in case. (I really doubt this though)
-------------------------------------------------------------
to pressurize the case, you have to take outside air...so, unless you are using filters, you are blowing dust in you case.



-Always put the blame on you first, then on the hardware !!!

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Copenhagen   02-02-2002 at 11:07:20 PM
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Besides the fan(s) in the power-supply you basically only need 1 extra exhaust fan. If your case allows for two extra exhaust fans choose the upper exhaust and block the lower. If you have some PCI/AGP cards that needs extra cooling you can use the lower exhaust fan also. Forget all about intake fans, in my opinion they are only useful together with dust-filters if you want to keep your case dust-free. In that situation you want to control the air intake so that it passes through your filter and not all the other openings in the case.


<i>/Copenhagen</i>

<b><i>Seagate Barracuda IV.
Bad performance in RAID setups!
</i></b>

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mbetea   02-02-2002 at 11:13:25 PM
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i had 3 sunon case fans. i use an in-win fulltower and was starting to get irritated by the fans. i unplugged them all to see the difference. well being a LOT quieter and raising temps 2 degrees, i've left them unplugged. i'll get a couple low speed/ultra quiet ones. but for now it's fine (the room is usually pretty cool all year, so that's one reason i think it doesn't make that drastic of a difference).

happiness is finding a stick of ram in your mail.

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Copenhagen   02-02-2002 at 11:40:03 PM
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<blockquote><font size=1>Svar på:</font><hr><p>but for now it's fine (the room is usually pretty cool all year, so that's one reason i think it doesn't make that drastic of a difference).<p><hr></blockquote><p>Yes, it really depends on the specific system. Some systems will do just fine with the fan(s) in the power-supply. Others, like my own, being highly overclocked with a high Vcore, actually emits less noise with 1 extra case fan than without. Reason: The power-supply fan cannot refresh the air in the case quickly enough and the build up in temperature causes the temperature controlled fan in the power-supply to rotate faster thus producing more noise. Also the temperature controlled CPU fan increases its speed and thus emits more noise.


<i>/Copenhagen</i>

<b><i>Seagate Barracuda IV.
Bad performance in RAID setups!
</i></b>

Reply to Copenhagen
somerandomguy   02-03-2002 at 12:20:00 AM
- 0 +

I experimented with a few different case fan configurations when building my PC. The problem I had was that the slow quiet fans I was using couldn't move enough air through my full tower case, and didn't provide adequate cooling.
The solution I came up with was to disconnect all my case fans and just leave the side panel off my case. It runs 5 degrees cooler, and it's quieter because I don't have those extra fans.

"Ignorance is bliss, but I tend to get screwed over."

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