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Fans and Rads, I am confused. - Page 8

post #71 of 200
actually fans have higher static pressure the slower they spin according to every graph

http://martinsliquidlab.org/2013/02/18/why-static-pressure-max-flow-specs-are-poor-measures-of-fan-performance/

and a 140 rad with the right fans will outperform a 120 rad with less 'noise'

http://www.overclock.net/t/1455994/lightbox/post/21541857/id/1792565

edited to fix comparison
Edited by pc-illiterate - 1/13/14 at 9:43am
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post #72 of 200
^^^ To give a real world example of the above, in my MH10 I'm using 3 x 480 BlackIce SR-1s--- thin rads with low FPI of 9. I'm using low RPM AP14 Typhoons.

Ambient air temp: 21ºc
Furmark stress on 3x GPUs: 36ºc
Prime95 stress on CPU: 55ºc

That is with the pump at 33% power and the fans at 900RPM (66% power), nevermind cranking it up. I appreciate overkill as much as anyone but bigger isn't always better.
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post #73 of 200
I hink there is no debate that faster fans will outperform slow ones.
Of course a slower fan will have higher static pressure, because it has to push less air throught the rad.

My point was that thinner rads will outperform a thicker one with same fpi and build at low rpm.
And a thinner rad in push/pull will further outperform a thick one with only push or pull, especially at low rpm.

And sorry pc-ill, that second link doesn't work on my phone. I'll have to wait til I get home for it.
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post #74 of 200
Quote:
Originally Posted by pc-illiterate View Post

actually fans have higher static pressure the slower they spin according to every graph

http://martinsliquidlab.org/2013/02/18/why-static-pressure-max-flow-specs-are-poor-measures-of-fan-performance/

and a 140 rad with the right fans will outperform a 120 rad with less 'noise'

http://www.overclock.net/t/1455994/lightbox/post/21541857/id/1792565

edited to fix comparison

fans with more static pressure spins slower because of their bigger blades, you wont get more pressure if you slow down a fan.. and 140 vs 120 is not the thickness smile.gif
Just observing here..
Edited by GaMbi2004 - 1/13/14 at 11:39am
 
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post #75 of 200
Quote:
Originally Posted by GaMbi2004 View Post

fans with more static pressure spins slower because of their bigger blades, you wont get more pressure if you slow down a fan.. and 140 vs 120 is not the thickness smile.gif
Just observing here..

Yeah I agree. I went to work and could not wrap my head around the idea that a slower fan would produce more pressure. It's just completely illogical.
So I looked back into the MLL link that pc-ill provided.
It's important to understand that the cougar curve provided was at a given fixed fan speed of 1500 rpm.
As restriction lever AND cfm are increased while at the same rpm, static pressure will decreasr. That is not to say static pressure will increase as rpm is decreased.

So I stand on my original statement that at a lower rpm, there will be less static pressure.
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post #76 of 200
Quote:
Originally Posted by pc-illiterate View Post

actually fans have higher static pressure the slower they spin according to every graph

http://martinsliquidlab.org/2013/02/18/why-static-pressure-max-flow-specs-are-poor-measures-of-fan-performance/

and a 140 rad with the right fans will outperform a 120 rad with less 'noise'

http://www.overclock.net/t/1455994/lightbox/post/21541857/id/1792565

edited to fix comparison

That first graph does not mean that pressure increases when the fan slows down. The whole graph is for a single RPM, the fan does not change speed. All it indicates is that the fan produces its highest static pressure at zero airflow, ie if the fan was completely blocked, it doesn't have to use any energy moving air as such so it all goes into pressure. As the restriction on the fan drops and the CFM goes up the pressure the fan can produce decreases.
Its really just like a pump, high pressure at low flow and low pressure at high flow. For the same pump or fan speed.

The graph just shows that at max RPM of the fan if you put a lot of restriction in front of it the CFM will go down.
Edited by Jakusonfire - 1/13/14 at 12:32pm
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post #77 of 200
Quote:
Originally Posted by Jakusonfire View Post

That first graph does not mean that pressure increases when the fan slows down. The whole graph is for a single RPM, the fan does not change speed. All it indicates is that the fan produces its highest static pressure at zero airflow, ie if the fan was completely blocked, it doesn't have to use any energy moving air as such so it all goes into pressure. As the restriction on the fan drops and the CFM goes up the pressure the fan can produce decreases.
Its really just like a pump, high pressure at low flow and low pressure at high flow. For the same pump or fan speed
Precisely!
In the end, slimmer rads, with low fpi count will outperform thicker ones at low speeds. Not by much, only MLL's insane tests can register a difference. But the added benefit of a slimmer rad is it allows you to use p/p which will really increase your performance, especially at low speeds,
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post #78 of 200
makes sense why i thought it never made sense. its why i trusted respected testers' and reviewers' information. so glad someone explained it to me.
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post #79 of 200
Thread Starter 
Quote:
Originally Posted by pc-illiterate View Post

did you say you bought the bitspower multi-z 150 for the aqua pipe and 3 hole top? doh.gif

Yeh Doh is more than right, rep added!!!! and some, lucky I only payed a tenner more than that thumb.gif
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post #80 of 200
Thread Starter 
Quote:
Originally Posted by PepeLapiu View Post

Too many guys get caught up in the idea that thicker, wider rads will cool better. But such is not always the case.

So in the end, at low speed, a thinner rad will perform better than a thick one. And a thinner rad with push/pull will perform even better.

But on a thick 140mm rad with high fpi count, in push or pull only, you will need the best fans out there, and they won't perform as well when silent.

I have to say you are right. I admit seeing the monsta 80mm and said, I need to have it but what you and the guys have said makes perfect sense. SO if I am reading correctly, and between the lines here, there really would be no point having a push pull in a build meant for silence as I will need double the fans. Well maybe not 'no point' but it is probably better to get a thinner rad with with either push or pull with good fans.

The thicker the rad the faster the fans need to go hens the more rpm and louder, not silent, a ha I get it now. Well I am certainly going for a silent build and really don't know if I can justify push pull. I meanI am completely OK with using one set of fans with the fans that have been suggested to me.

It sometimes takes me a little while to understand that what looks the best may not always perform the best, well in this case anyway. In any case I appreciate your help.
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