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Replace 140 mm fan?

post #1 of 4
Thread Starter 
EDIT: Using this thread for a new question since I've pretty much just made it.

I'm thinking of getting a Fractal Design Define XL and I was thinking of replacing the front 140 mm fan with 2 Noiseblocker XK2's.

Would a 1150 RPM fan perform significantly better than a 600/800 RPM (depends on where you ask) fan?



___________________________________________
I was looking at fan specs and I noticed these:

http://www.caseking.de/shop/catalog/Luefter/120mm-Luefter/Noiseblocker-BlackSilent-Fan-XL1-120mm::12826.html

http://www.caseking.de/shop/catalog/Luefter/120mm-Luefter/Noiseblocker-BlackSilent-Pro-Fan-PL1-120mm::13588.html

Both are 120 mm, the first is 1000 RPM, the second is 900 RPM.
How can the 900 RPM have TWICE the static pressure? Like, they have the same number of blades and they even seem to be angled the same, so is it a lack of standards for testing or is it straight up lying?

Edited by B!0HaZard - 1/8/12 at 3:29pm
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post #2 of 4
(Translated) "In addition, the framework for use on radiators were designed, where he provides in addition to the decoupling for optimum sealing. This will prevent air from escaping through the minimum gap between the fan and radiator, and thus can not contribute to cooling."

The 900 RPM model is pitched as a watercooling fan for radiators. My only guess is that they tested the static pressure in different situations: the 1000 RPM model may have been pushing air while maintaining that pressure, while the slower one's pressure was measured at little or no air flow.

Or it's just BS. Bad advertising, either way.
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post #3 of 4
It's a misprint.
The PL1 has a 1.761,should be .761.
The NB site has them much closer.

XL1 - http://www.noiseblocker.de/en/BlackSilent120.php
PL1 - http://www.noiseblocker.de/en/BlackSilentPro120.php


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post #4 of 4
Thread Starter 
Quote:
Originally Posted by Gyro View Post

It's a misprint.
The PL1 has a 1.761,should be .761.
The NB site has them much closer.
XL1 - http://www.noiseblocker.de/en/BlackSilent120.php
PL1 - http://www.noiseblocker.de/en/BlackSilentPro120.php
Gyro

I just checked the site, they don't even provide the mm H2O numbers. Don't know where Caseking got them.

It's just weird that it's the same for their 140 mm models on Caseking. XK2 has low static pressure, PK2 has high.


Unrelated, what speed should a 140 mm spin at to have the same static pressure as, say, a 120 mm 1000 RPM fan? AFAIK, bigger fans provide less static pressure and more airflow at the same, but I may be wrong? I tried to match a 120 mm's and a 140 mm's static pressure and the 120 mm fan needed lower RPM, but it's a 9-blade vs. a 7-blade, so I'm not sure.

EDIT: Doesn't matter, answered this.
Edited by B!0HaZard - 1/8/12 at 3:28pm
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