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

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???
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  1. 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.
  2. 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?
  3. amuffin 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
  4. 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...
  5. 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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