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Old 01-23-2012, 05:44 AM   #1
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Default Which is the Best Place to Install a Case Fan?

There has been a new article posted.

Title: Which is the Best Place to Install a Case Fan?
URL: http://www.hardwaresecrets.com/artic...-Case-Fan/1473

Here is a snippet:
"Nowadays, most cases have several places where you can put a fan. Supposing that you want to install only one fan on your computer, where is the best place to do it? Let's run some tests and find out...."

Comments on this article are welcome.

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Old 01-23-2012, 10:07 PM   #2
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Nice simple article that's easy to grasp. I'm curious if you'll continue these tests and gradually make them a bit more complex. For example, two fans! Or diminishing returns of temp vs noise?
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Old 01-24-2012, 01:53 AM   #3
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In the next test, we will measure the video card temperature for different case fan configurations. Stay tuned for more rock'n'roll.
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Old 01-24-2012, 09:55 PM   #4
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Default Thanks!

It's a good review! But instead of measuring just the CPU temp, additional components like GPU and HDD temp readings would have been very useful! From what I know HDDs are most sensitive to temp changes rather than CPU/GPU!

I currently keep my case side open and have a mini table-fan cooling my rig! My room temps would be around 28 to 34 C. My HDDs would do 32 to 34 C, with an open case + FAN. If I close my case and enable front+rear+side fans, HDDs would do 37 to 40 C!

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Old 01-25-2012, 01:50 AM   #5
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We will publish another article, testing GPU, HDD and motherboard temperatures.
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Old 01-25-2012, 02:54 AM   #6
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The only eyebrow raiser in this article is the efficiency of a single front fan.
For the type of computer hardware used in the test I'd pick a case with the PSU on top, eliminating the need for a separate fan.

For the future tests it would also be nice to see what happens when meshed areas are shut off to direct the airflow to parts where it's needed.

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Old 01-25-2012, 06:35 AM   #7
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@Rafael Coelho
Thanks! Will wait for it


@Olle P
I think keeping the PSU on top would reduce the efficiency! As hot air inherently rises up and a PSU on top would completely obstruct it! Also I think a fan to push the heat away from PSU on top would increase the efficiency.
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Old 01-26-2012, 04:09 AM   #8
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A top-mounted PSU pulls its air from the top of the case and exhausts it, there's no obstruction. The PSU itself may not be cooled as well, but a quality PSU won't sweat the difference.
I liked the article. While somewhat intuitively obvious so far, it's still nice to see it actually tested and shown to be true.
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Old 01-26-2012, 04:23 AM   #9
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Yeah. Top mounted PSU's components wouldn't be cooled in an optimized fashion, which in turn would decrease efficiency of the PSU.
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Old 01-28-2012, 03:28 AM   #10
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Quote:
Originally Posted by shriganesh View Post
I think keeping the PSU on top would reduce the efficiency! As hot air inherently rises up and a PSU on top would completely obstruct it! Also I think a fan to push the heat away from PSU on top would increase the efficiency.
I think that the natural convection inside a computer is often severely overrated! Even the weakest fan will counter it without any problems, if so desired.

The PSU on top will allow the PSU fan to cool the entire computer without a need for any additional case fans. This was the standard setup for tower style computers pretty much up until the power hungry Prescott CPUs took the stage, and will provide more than sufficient cooling for computers that don't generate lots of heat.

Since the PSU will be fed lukewarm air the fan will have to spin slightly faster, increasing the noise and very marginally decreasing PSU efficiency.

A second fan removing heated air at the PSU intake will, as I know by experience, only add problems. The result is a "fight" for the available air, forcing both fans to work harder and noisier with a very limited effect on CPU cooling.
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