High vs. Low RPM Fan Performance

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skribs

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Nov 22, 2011
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I'm looking forward at my next build, where I will be doing things I have not done in previous builds. One of those is a multi-GPU setup (which will be new for me unless you count an x2 card I had a while ago), and the other is liquid cooling. I have a few questions regarding LC, but I have a while until I build and this is the current burner for me.

I've seen the basic data that says "high RPM fan louder and do more cooling." (Basically what anyone with a basic understanding of cost effectiveness can figure out.) However, what is the actual performance difference for high RPM fans vs. low RPM fans?

Is there a significant difference in possible benchmarks?

Will they have any noticeable boost to gaming performance (or the possibility of upping the settings/resolution and not taking a hit in performance)?

How loud are the loudest fans, and do they easily fade into the background?

What is the difference between adding an extra radiator with low speed fans vs. going to high speed fans? (i.e. what would be the difference between a 360mm radiator with fans at 2000 RPM and 2x360mm radiators with fans at 800 RPM)?

I have not seen these questions answered, but I will be the first to admit I am absolutely terrible at research.
 
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i7Baby

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Is there a significant difference in possible benchmarks? - what benchmarks?

Will they have any noticeable boost to gaming performance (or the possibility of upping the settings/resolution and not taking a hit in performance)? - what's they? fan rpm? If CPU and GPU can be kept cooler then they work better.

How loud are the loudest fans, and do they easily fade into the background? - This info can be looked up eg http://www.noctua.at/main.php?show=productview&products_id=9&lng=en

What is the difference between adding an extra radiator with low speed fans vs. going to high speed fans? - really needs context. An extra radiator will help cooling more than going from low to high speed fans. But most people just use one radiator anyway.

 
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skribs

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What benchmarks? Common CPU and GPU benchmarks.

My question on gaming performance is related to cost effectiveness. How much will the performance increase vs. the sound generated by using higher RPM fans, all else being equal? I.e. if the fans are twice as loud, will it have a 10% increase in performance? 2%? 30%?

I am fully capable of looking up static pressure, RPM, CFM and dBA levels. I'm looking for the real world application of those numbers. What does it subjectively sound like, and what effects does it have on performance?

This is similar to knowing that a 6 core CPU at 3 GHZ vs. A 4 core at 3.5 GHz will do different things better, but wanting to know specifically what impact it will have in various situations (i.e. what is the FPS difference in various games, benchmark scores, and how fast can they perform specific tasks).

This is the kind of infornation I'm looking for. Not the stats sheet on the fan, but how that stats sheet affects overall performance and if that performance gain is worth it.
 
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skribs

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http://www.overclock.net/t/1457426/radiator-size-estimator

I found the answer on OC.net. I wasn't sure if fan speed would have a logarithmic or linear effect, but the data here suggests a linear effect on cooling potential. Doubling the RPM of the fans seems to be just as effective as doubling the size of the radiator, from the data suggested here.

This gives me a good idea of where to go on this subject.
 
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Marco Marcomike

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just let the fan run alone especially cpu fan of the stock or radiator and also water cooling system,because they are smart cpu fan system(1 head),However, when you start overclock cpu.The fan will run 2500rpm or more.means you've already started,heard he worked hard,for the stock cpu fan,you can try to connect with,LOW NOISE ADAPTER,BTW'if you have a plan to install water cooling it is good,There are many brands this system.if you plan to Large gpu and liquid cooler for cpu, Your case must be have holes for fans.at the top,if you use case no holes on the top,then you install liquid radiator(rear case)it will be a crisis(airflow)As the fan to radiator they can't work for exhaust,and fan for the top,bottom and front buy the PWM Fan connect 2 or 3 fan from the 2 another smart fan system.(head)use silicone fan mounts reduce vibration
 
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iamlegend

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Logarithmic or Linear effect? I think you mean exponential instead of logarithmic. If this information is what you`re looking, you should make a study by yourself or by "thesis" group and systematically determine the difference of LSF vs HSF.

If you are pretty detailed on the answers you wanted to get, you will have a hard time finding it here.
 
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