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Optimal radiator airflow AND fan multiport

post #1 of 5
Thread Starter 
hey guys,
I'm double tapping it today because I'm lazy, yes yes i know, shame on me but here we go regardless.
i have two questions:
1. What is the best airflow to have on The Black Ice GTX Xtreme Radiator?

2. Why do all the fan multiports have different sets of voltage plugs? would i not want all my fans to have the same voltage? (an yes that is what i would prefer)

Thanks in advance everyone!
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post #2 of 5
Quote:
Originally Posted by JRHudson View Post
hey guys,
I'm double tapping it today because I'm lazy, yes yes i know, shame on me but here we go regardless.
i have two questions:
1. What is the best airflow to have on The Black Ice GTX Xtreme Radiator?

2. Why do all the fan multiports have different sets of voltage plugs? would i not want all my fans to have the same voltage? (an yes that is what i would prefer)

Thanks in advance everyone!
1. The HW Labs Black Ice GTX Extreme likes fast fans. Faster is better but > 1400 rpm work well.

2. If I understand your question, 12 volts is full speed for fans. Some run fans at lower volts to lessen noise. Medium speed Yate Loons are reportedly nearly silent at 7 volts and High speed Yate Loons at 5 volts. You can listen to the video of the fan testing by Martinm and glance at the voltage meter to get an idea of relative differences.

Hope that helps. Good luck.
    
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post #3 of 5
Thread Starter 
Quote:
Originally Posted by musicfan View Post
1. The HW Labs Black Ice GTX Extreme likes fast fans. Faster is better but > 1400 rpm work well.

2. If I understand your question, 12 volts is full speed for fans. Some run fans at lower volts to lessen noise. Medium speed Yate Loons are reportedly nearly silent at 7 volts and High speed Yate Loons at 5 volts. You can listen to the video of the fan testing by Martinm and glance at the voltage meter to get an idea of relative differences.

Hope that helps. Good luck.
I have been doing this stuff for awhile but i cannot seem to get my head wrapped around this whole "which rad is optimized for what type of fan" thing. So i gotta ask, do i look at rpm's or CFM when i'm choosing my fan?
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post #4 of 5
It is more the radiators that work best at a particular fan speed because of design.

If you read this triple radiator comparison by Skinnee Labs, you can see how the radiators differ from each other when they are tested. It's hard to know the radiator's characteristics until testing but sometimes we get hints because spacing of the fins is tight for example.

The fan testing is conducted by fan rpm so that one says a radiator might do well with slow (low rpm fans) while others may not. Some require high rpm fans to do well, that is dissipate heat. The attached chart is from Skinnee's testing and gives you the visual comparison of several different radiators based on how much heat they dissipate with a particular speed of fan.

When comparing fan to fan, specifications or fan specs include cfm at a particular rpm and usually a dBA measurement. Also important is the static pressure or power of the fan on the radiator. It is often hard to find and you may need to Google it. That measurement is usually given in millimeters or inches of water. The more static pressure of a fan, the best it pushes/pulls air even against the resistance of a radiator.

Oops, I did not directly answer your question. You choose the fan on both the cfm and rpm. You want a fan that will do what you ask and that may mean it reaches a particular cfm or static pressure. The rpm correlates with the cfm so you often need a higher rpm fan to reach that cfm/static pressure. The cfm roughly correlate with static pressure but is imperfect because some fans are not very good on ventilators (low static pressure), possibly because of fan blade design, but make fine case fans. The rpm also correlates with noise although some fans at 1850 rpm sound less obnoxious than others. That's when the listening tests by Martinm help. If price was no issue, one could always choose high end fans like Noiseblocker models. But a high speed Yate Loon at 5 volts can run about 1200 rpm and move a reasonable amount of air at 20 dBA (very quite)...and cost about $5 each compared to the $25 or $30 or a Noiseblocker. So if you stick to Noiseblockers or Gentle Typhoon AP-15 1850 rpm, you could probably ignore most of the geeky fan stuff. Then choose a fan controller to turn them down when you are not stressing them or get the PWM Noiseblockers that raise and lower a fan speed based on motherboard temperatures. Hope some of that answers your question.

Good luck.

Edited by musicfan - 8/18/11 at 8:11am
    
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post #5 of 5
Thread Starter 
Quote:
Originally Posted by musicfan View Post
It is more the radiators that work best at a particular fan speed because of design.

If you read this triple radiator comparison by Skinnee Labs, you can see how the radiators differ from each other when they are tested. It's hard to know the radiator's characteristics until testing but sometimes we get hints because spacing of the fins is tight for example.

The fan testing is conducted by fan rpm so that one says a radiator might do well with slow (low rpm fans) while others may not. Some require high rpm fans to do well, that is dissipate heat. The attached chart is from Skinnee's testing and gives you the visual comparison of several different radiators based on how much heat they dissipate with a particular speed of fan.

When comparing fan to fan, specifications or fan specs include cfm at a particular rpm and usually a dBA measurement. Also important is the static pressure or power of the fan on the radiator. It is often hard to find and you may need to Google it. That measurement is usually given in millimeters or inches of water. The more static pressure of a fan, the best it pushes/pulls air even against the resistance of a radiator.

Oops, I did not directly answer your question. You choose the fan on both the cfm and rpm. You want a fan that will do what you ask and that may mean it reaches a particular cfm or static pressure. The rpm correlates with the cfm so you often need a higher rpm fan to reach that cfm/static pressure. The cfm roughly correlate with static pressure but is imperfect because some fans are not very good on ventilators (low static pressure), possibly because of fan blade design, but make fine case fans. The rpm also correlates with noise although some fans at 1850 rpm sound less obnoxious than others. That's when the listening tests by Martinm help. If price was no issue, one could always choose high end fans like Noiseblocker models. But a high speed Yate Loon at 5 volts can run about 1200 rpm and move a reasonable amount of air at 20 dBA (very quite)...and cost about $5 each compared to the $25 or $30 or a Noiseblocker. So if you stick to Noiseblockers or Gentle Typhoon AP-15 1850 rpm, you could probably ignore most of the geeky fan stuff. Then choose a fan controller to turn them down when you are not stressing them or get the PWM Noiseblockers that raise and lower a fan speed based on motherboard temperatures. Hope some of that answers your question.

Good luck.
that was a absolutely excellent response, Ive never had someone explain it so clearly, thank you and much respect!
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