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12-02-2003, 05:54 AM
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#1 (permalink)
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Join Date: Sep 2003 Location: Germany
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Correct way to install casing fans?
I've got a desktop, AMD 2400+, Arctic Copper Silent 2 Rev 2, on a midi-tower casing with 2 custom installed casing fans.
Problem is, I'm having CPU temps like 40°C and mobo temps at 36°C when inactive.
During heavy gaming CPU goes to 55°C and mobo 50°C.
I believe wrong casing fan installation might have something to do with it. Any ideas? Websites with pictural references will be welcomed!
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12-02-2003, 05:59 AM
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#2 (permalink)
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Join Date: Oct 2001 Location: Finland
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Well that is not necessarily true.
Fanning should be so that from bottom front of the case, there should be cold air intake, and from the back top (power) there should be exhaust.
My fanning is like that, and still my cpu runs at 50C idle, and 60C at load. Mobo is always at 23 though.
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12-02-2003, 08:02 AM
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#4 (permalink)
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Join Date: Feb 2003 Location: Falkville, Alabama
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12-03-2003, 02:35 AM
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#5 (permalink)
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Join Date: Sep 2003 Location: Germany
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Well I have read the articles but I'm still not sure what I did wrong.
Room temperature is around 20-25°C, so 55-60°C under load is too high, ain't it?
I'll try to put it into words:
Cheap midi tower casing.
Power supply at the back side, it blows air OUT OF the PSU.
Casing fan 1 at back side as well, located about 3 cm below the PSU, is blowing air INTO the casing.
Casing fan 2 at front side, located just 5 cm above the ground, blowing air INTO the casing.
This is what I think:
Casing fan 1 is just nearby the CPU, so I thought blowing air into the casing onto the CPU heatsink is nice.
Casing fan 2 is situated just below my harddisk, so it cools it down as well. The air which is blown into the casing by this Casing fan 2 is (unfortunately) mostly recycled air, since the front and side of my casing is neatly sealed. Though some fresh air could be sucked in through the gap for my FDD casing hole (which I custom bored since it was originally too small).
I am relying on my PSU fan to suck out the hot air, and also the higher pressure in the casing to push hot air out from the little holes between Casing Fan 1 and ground.
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12-03-2003, 05:50 AM
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#6 (permalink)
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Join Date: Feb 2003 Location: Falkville, Alabama
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| Quote: |
Casing fan 1 at back side as well, located about 3 cm below the PSU, is blowing air INTO the casing.
| Casing fan 1 should be blowing air out, not in. Your CPU heatsink fan is blowing hot air off the fins of the heatsink and this fan should be used to evacuate that hot air out of the case. This will also help increase the airflow from Casing fan 2.
I would also try to open up the area under the bottom edge of your front cover to help air flow into the case.
You need to increase air flow "through" your case, so change the casing fan 1 to blow out.
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12-03-2003, 07:22 AM
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#7 (permalink)
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Join Date: Aug 2002 Location: Manchester, UK
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Well, my Heatsink/Fan combo tends to blow cold air down onto the Heatsink... I have one rear fan which is about 1 inch away from the Heatsink taking air out, that isn't good, is it. It doesn't really matter as I have temps around 40*C idle and 49*C full load.
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12-03-2003, 08:43 AM
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#8 (permalink)
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Join Date: Feb 2003 Location: Falkville, Alabama
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| Optimus Prime, yes that is good. You want the hot air out of your case and cool air in, otherwise you are just re-circulating hot air.
Selphie, the fan on the back of your power supply probably isn't enough by its self to evacuate the hot air out of your case. Have you thought about putting a blow hole in the top of your case. The whole idea is to get airflow through the case, that way cool air goes in and hot air goes out allowing your heatsink fan to blow cool air on you heatsink all the time. If I were you I would change casing fan 1 to blow out and then I would put a more powerfull fan in the front and relieve the area under the bottom front edge to increase airflow.
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12-03-2003, 08:46 AM
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#9 (permalink)
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Join Date: Aug 2002 Location: Manchester, UK
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But wouldn't the Heatsink and rear fan be fighting for air?
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12-03-2003, 09:01 AM
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#10 (permalink)
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Join Date: Oct 2001 Location: Illinois
Posts: 1,908
| Quote: Originally posted by Optimus Prime
But wouldn't the Heatsink and rear fan be fighting for air? | Not if you have a front fan pulling air in. I consider a front 'intake' fan mandatory on the most basic setup.
WB
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