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2x 120mm vs. 2x 140mm fan (case-fan purpose) - Page 3

post #21 of 25
Comparing apples with apples, a 140mm fan has roughly 40% more effective blade disk area to work with - that's with both 140 and 120 mm designs sharing the same blade hub diameter. Even with a bigger motor housing/blade hub, the 140mm should have the advantage.

So for comparable CFM results, the 140 can be using either much slower RPM, or much milder blade pitch, leading to much quieter and more efficient operation.

It is kinda like engine displacement: a 140 is a 6-cyl, a 120 is an i4-cyl. The fact that there are many amazing 4cyl out there that outperform a lot of 6-cyl engines 40% or more bigger in displacement, doesn't mean that cars with 6-cyl engines are fail, or the cars featuring them are slow. Apples for apples ppl.
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post #22 of 25
Thread Starter 
Quote:
Originally Posted by dtolios View Post

Comparing apples with apples, a 140mm fan has roughly 40% more effective blade disk area to work with - that's with both 140 and 120 mm designs sharing the same blade hub diameter. Even with a bigger motor housing/blade hub, the 140mm should have the advantage.
So for comparable CFM results, the 140 can be using either much slower RPM, or much milder blade pitch, leading to much quieter and more efficient operation.
It is kinda like engine displacement: a 140 is a 6-cyl, a 120 is an i4-cyl. The fact that there are many amazing 4cyl out there that outperform a lot of 6-cyl engines 40% or more bigger in displacement, doesn't mean that cars with 6-cyl engines are fail, or the cars featuring them are slow. Apples for apples ppl.

I was comparing both the S1 120mm and TY-140 140mm at around the same RPM. But the 140mm got outclassed in cfm acording to the results at xbitlabs. I guess all the good design and features have been for so much longer in 120mm fans, that the top tier ones, simply just stands out in every way.

Not only did the S1 120mm dominant in terms of cfm over the TY-140 140mm, it were also more quiet.

NB multiframe S1
http://www.xbitlabs.com/articles/coolers/display/120-140-fans-roundup_16.html

Thermalright TY-140
http://www.xbitlabs.com/articles/coolers/display/140mm-fan-roundup_9.html#sect0

The TY-140 were the top winner of the 140mm roundup. But even that one, can't beat the S1 120mm fan.
Edited by wendigo4700 - 8/28/12 at 6:10am
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post #23 of 25
Confusion is because of the thread title.
Quote:
2x 120mm vs. 2x 140mm fan (case-fan purpose)
post #24 of 25
Quote:
Originally Posted by wendigo4700 View Post

But about moving more air.
140mm Thermalright TY140 around 600RPM = around 11.9 cfm
120mm NB multiframe SH1 around 600RPM = around 13 cfm
These are from xbitlabs.com pictures I posted. The TY140 is not a poor or average fan, its a top tier one. And yet it doesnt push more air though, acording to xbitlabs test.
But I can't compare those two fans, if they are not the same design?

Like I had stated earlier on post #3 whistle.gif
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post #25 of 25
Quote:
Originally Posted by wendigo4700 View Post

I was comparing both the S1 120mm and TY-140 140mm at around the same RPM. But the 140mm got outclassed in cfm acording to the results at xbitlabs. I guess all the good design and features have been for so much longer in 120mm fans, that the top tier ones, simply just stands out in every way.

Not only did the S1 120mm dominant in terms of cfm over the TY-140 140mm, it were also more quiet.

NB multiframe S1
http://www.xbitlabs.com/articles/coolers/display/120-140-fans-roundup_16.html

Thermalright TY-140
http://www.xbitlabs.com/articles/coolers/display/140mm-fan-roundup_9.html#sect0

The TY-140 were the top winner of the 140mm roundup. But even that one, can't beat the S1 120mm fan.

Gonna revive this discussion, since I was currently looking up 140mm vs 120mm myself. It's important to note that the testing methodology to measure CFM changed from the time the 120mm NB was done, to the time the TY140 was done. The NB was done using a plastic bottle (http://www.xbitlabs.com/articles/coolers/display/120-140-fans-roundup.html#sect0), while the measurement of CFM for the Thermalright was done much differently:
http://www.xbitlabs.com/articles/coolers/display/140mm-fan-roundup.html#sect0

It doesn't look like you can directly compare the CFM between the two, based on the different methods (700 straws!). I'm inclined to think dtolios was correct here.

Cheers!
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