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Old 04-28-2013, 04:37 PM
orphantoad orphantoad is offline
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Default Need help deciding on fans

Hi all,

I've pre-ordered a 350d from Amazon, and I was wondering if you guys can help me out deciding which fans to use with it, as I'm looking to replace the stock fans with AF/SP fans.

I want the case to be quiet, so for the front and rear case fans, I'm thinking about the AF120 quiet editions. But looking at certain reviews, it seems the SP120s actually perform better. For example, this XBitLabs review shows the SP120 QE peforming better than the AF120 QE in both noise and airflow. The tables in this review also show the SP120s moving more air at similar noise/RPM levels over the AF120 QEs.

So having said all that, I'm a little conflicted on whether or not I should get AF120 QEs or SP120 QEs. One thing I will say is that I plan to use all of the fans as intakes for the front and rear, and I will be exhausting out the top with an H100i. I will also be using dust filters with all of them (except for the top exhaust).

So with that information, what do you guys recommend for me to use?

Thanks!

Last edited by orphantoad; 04-28-2013 at 07:53 PM.
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Old 04-28-2013, 08:45 PM
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jlhawn jlhawn is offline
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I run SP fans due too the filters in my case for intake, I run AF fans for exhaust as there is no filter. SP fans are designed move air through tight items such as radiators, heatsinks, and filters.
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Old 04-28-2013, 10:03 PM
orphantoad orphantoad is offline
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But does it matter if the restriction is on the "push" or "pull" side? For example, if I have a 120mm fan as intake, and I have a dust filter on the side where it's pulling air from, would a SP or AF fan be better? As far as I understand, static pressure is only good for when the restriction is on the side the air is being blown into.
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Old 04-29-2013, 04:08 AM
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Correct. That's why it is termed "static pressure". Different blade configurations and profiles will return varying performance numbers; dependent upon whether they have resistance on the output side or not. If only moving air through a volume, with minimal resistance--as through a case, one blade profile will perform better than another. When maintaining inches of water pressure, as in the case of pushing air through a radiator that has significant resistance, the blade profile designed for that application is best. A flow fan does not maintain pressure very well and the blades drop into cavitation easily; the wings are stalling when that happens and the RPM increases because there is less work being done.

That said, all muffin fans suffer from restricted inputs. Any obstructions: grilles, perforated metal, filters, etc., unless kept a sufficient distance away from the blades themselves, will cause starvation and the RPM will increase, as in the previous example. In these instances, the air flow is disrupted too close to the blades and the flow across them is diminished; dropping their efficiency.
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Last edited by Speed; 04-29-2013 at 04:13 AM.
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Old 05-14-2013, 03:31 AM
shimeng shimeng is offline
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SP 120 Performance Ed for intake on a fan controller. That way you can crank it up/down when you need to.

At 7 volts it performs just as well as the Quiet Ed.
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Old 05-14-2013, 06:49 AM
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Use the AF series for case fans and the SP series for radiators.
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