Tom's Hardware > Forum > Overclocking > Cooler and Heatsinks > Is It Best to have Fans Suck in or Blow Out?

Is It Best to have Fans Suck in or Blow Out?

Forum Overclocking : Cooler and Heatsinks - Is It Best to have Fans Suck in or Blow Out?

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YO_KID37   01-27-2006 at 02:53:52 AM

I Found on AMD's website that the best configureation for AMD systems is to have 2 Case fans Blowing Out and 1 Power Supply Fan Also Blowing out, and let the rest of the air just seep through the small holes around the computer. Agree or Disagree Polling and Reply!

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jtt283   01-27-2006 at 03:06:06 AM
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You want even flow, to replace hot air with cool. Neither pressure in your case nor a partial vacuum is going to cool anything. I'd stick a case fan and/or a hard drive cooler in front blowing IN, and another case fan plus the PS blowing OUT to get airflow across as much of the system as possible. For best results, replace your ribbon cables with round ones.

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Aceprowler   01-27-2006 at 03:31:36 AM
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I've always had all my cases set the same.

Front fans blowing in, back fans blowing out, to get an even airflow throughout the case, and side fan blowing in as well.

I don't care for AMD's config. only because of dust getting into my 650watt power supply. 2 fans is enough for that I would think.

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7H4_D00D3   01-27-2006 at 04:11:09 AM
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Totally agree

The Ideal air cooling consists in AT LEAST two blowers in the back (+1 PSU fan) 2x10mm or in a WCS 1x12mm suckers in the front and one 12mm blower on top of the case, right in front of the PSU, dunno where I read that, but I find it logic, hot air goes up, top cooler speeds up that process, front suckers bring new fresh air to the bottom, that keeps cool, as more cool air comes in, bottom air (cool) is pushed up

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infyrno917   02-07-2006 at 01:05:54 AM
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The best answer seems to be both. You would want to create an air flow within your PC's case. You can do this by providing a ratio of 1:1 of intake to exhaust fans and by keeping the fans with like flows together and not apart (exhaust on top (heat rises) and intake on the bottom). PC fans can't create a "measurable" partial vacuum because they simply don't have the power to do so; and even with air holes in your case, their surface area will have to equal the surface area of your fans to provide 100% effenciency. Or else they will run into resistance.

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7H4_D00D3   02-07-2006 at 04:16:02 AM
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Well, it might ne true that hot air doesn't flow up as fast, BUT no matter how slow it does it's an airflow, the smallest of the details HAS to be taken as an integral part of the total environemental conditions.....and hell! I know about precision, a SINGLE milimeter error on a drawing caused me to miss 100 meters of concrete for a highway (thank God it was only an exam xD!)

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