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To what extent is it acceptable to disregard CFM for better noise levels?

post #1 of 5
Thread Starter 
My case fans are really loud, and I would like to change them for some quieter ones. The quieter the better to be honest.

My case supports 3 front fans, 1 rear and 2 top, all 140mm. My current setup is 2 front intakes and one rear exhaust but I am willing to change this if there is a benefit to doing so.

Anyway, I was checking out this page on quietpc http://www.quietpc.com/140mmfans that ranks 140mm fans in terms of CFM and noise. Typically I have always bought Noctua fans in the past, and the fan I was looking at was the NF-A14 PWM, but upon checking out this table I noticed the Nanoxia Deep Silence 140mm PWM that supposedly is better at cooling and is quieter? I find that hard to believe but has anyone had one that can validate this?

The quietest fan however is the Noctua NF-P14s REDUX 900 but this has a CFM of 49 as opposed to the 67 of the A-14. Is it worth sacrificing this much cooling potential in an attempt to achieve a quieter build? If so, to what extent would be acceptable? Apologies if this is a stupid question...

Many thanks in advance

Brad
post #2 of 5

I would say that since you only have one video card (at least according to your rig), you should have no problem going with the quietest fans almost regardless of their performance.

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post #3 of 5
I ordered a few of these http://www.aerocool.us/accessory/images/dsfan_14blue.html the few reviews I have seen indicate they do offer the performance they state. At first I was just going to order the Noctua NF-A14 ULN because I want a completely quiet system.

71 CFM @ 15.5 dBA
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post #4 of 5
FActory specs are more a waste of time than they are help. The CFM rating is setting out in the open with no resistance .. so is the dBA reading. So unless you plan to use them to circulate air around the room they are not going to move their rated CFM or run as quiet as they are rated.

Here's a link to how fan actually perform in real use .. Their P-Q curves. 0.2 to 1.0mm H2O is usual working range of fans.
http://www.overclock.net/t/1491876/ways-to-better-cooling-airflow-cooler-fan-data/0_20#post_22644574
post #5 of 5
Quote:
Originally Posted by doyll View Post

So unless you plan to use them to circulate air around the room they are not going to move their rated CFM or run as quiet as they are rated.

Very true, however this kinda hit my funny bone as I am also looking at adding a ceiling fan and a mental image of a few Noctua fans hanging from the ceiling would provide a much different look

biggrin.gif
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