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Radiator vs Fans... which one is more important?

Last response: in Overclocking
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September 10, 2012 12:21:08 AM

Hello everyone, i am thinking in buying another PC when Haswell-E (or maybe just haswell) and next gen GPUs come out.... hopefully they will perform a lot better than current gen stuff in 3D with multiple monitors... anyways, that's not what i wanted to discuss here.

My questions is.... well i really don't know how to say it :lol: 

what i meant is, does fan pressure (CFM) plays a bigger role in water cooling than the radiators size?? i mean... its obvious that a radiator will perform better with a 80CFM fan than with a 30CFM fan but how big is the difference???
a c 150 K Overclocking
September 10, 2012 1:03:11 AM

Well, it really depends on the radiator we are talking about! This is where FPI(fins per inch) and static pressure comes in.

A thicker rad with lower FPI will require lower CFM fans, but a thinner rad with higher FPI will require higher CFM with more static pressure.



EX: A fan with 80CFM But low Static pressure will not perform as well as a 50CFM fan with high static pressure.
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September 10, 2012 1:06:00 AM

amuffin said:
Well, it really depends on the radiator we are talking about! This is where FPI(fins per inch) and static pressure comes in.

A thicker rad with lower FPI will require lower CFM fans, but a thinner rad with higher FPI will require higher CFM with more static pressure.



EX: A fan with 80CFM But low Static pressure will not perform as well as a 50CFM fan with high static pressure.


Ok ok ok.... now you got me confused!! isnt static preassure CFMs?
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a c 150 K Overclocking
September 10, 2012 4:04:23 AM

idroid said:
Wow!! now i get it... but static pressure isn't listed on fan specs.... what fans would you recommend me? preferably quiet and good looking ones :D 

Depends on your radiator!

Static pressure is listed on most fans...
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September 10, 2012 12:19:46 PM

amuffin said:
Depends on your radiator!

Static pressure is listed on most fans...


What's would be a good static preasure for this rad: http://www.frozencpu.com/products/16237/ex-rad-412/Alph... and this rad: http://www.frozencpu.com/products/13268/ex-rad-258/Cool...


and which rad is better?? this one http://www.frozencpu.com/products/13268/ex-rad-258/Cool... or this one:http://www.frozencpu.com/products/13015/ex-rad-245/Phob...

i really apreciate your help :D 
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a c 330 K Overclocking
September 10, 2012 1:47:21 PM

You could easily find $10-$12 fans that will work well for those as they are fairly normal FPI rads in the range of 8-12 FPI. Lower FPI means you can generally run slower/cheaper fans and still maintain good performance where fans that run 20+ FPI perform better with higher CFM/static pressure fans. All radiators perform best in push/pull and even high FPI rads can run well with slower speed fans in push/pull.
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