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Static pressure fans vs radiators

post #1 of 7
Thread Starter 
Question that I feel will help some new users like myself.

Let's say I have a 80mm thick 120mm radiator like the alphacool monsta.

Would I rather have a 3.90 mmH2O 76.8 CFM 2000rpm fan or a 3.00 mmH20 103CFM fan?

Would the less amount of static pressure be compensated for the cfm difference or would higher static pressure be better period?

example of the fans
http://www.frozencpu.com/products/11894/fan-779/BGears_B-Blaster_120mm_x_25mm_2000RPM_High_Speed_Fan.html
http://www.frozencpu.com/products/9780/fan-619/Cooler_Master_Blade_Master_120mm_x_25mm_PWM_Fan_R4-BMBS-20PK-R0.html

seems the bgears is 2000 rpm while the cm's are 600-2000
  
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post #2 of 7
depends on the fpi of the radiator as well.... lower the fpi = lower fan rpm,i think you can get a silent fan (around 1400rpm) with CFM around 50-60. higher the fpi = higher fan rpm. but of course you would higher CFM results.

Hope that helped a bit.
    
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post #3 of 7
Thread Starter 
Quote:
Originally Posted by ninojean View Post

depends on the fpi of the radiator as well.... lower the fpi = lower fan rpm,i think you can get a silent fan (around 1400rpm) with CFM around 50-60. higher the fpi = higher fan rpm. but of course you would higher CFM results.

Hope that helped a bit.

yes somewhat smile.gif

can we say there is one 8FPI and one 20FPI, in both of those, would the static pressure matter more than the cfm or how does it scale?
  
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post #4 of 7
I have a 80mm Monsta radiator and Corsair SP120 high flow fans, and I cant really see any temperature differance from running them at higher or lower speeds though. These fans are typicly "static" ones according to Corsair. I dont know what rpm they are running at though, because I use a fan speed controller.
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post #5 of 7
Quote:
Originally Posted by INCREDIBLEHULK View Post


there is one 8FPI and one 20FPI, in both of those, would the static pressure matter more than the cfm or how does it scale?

static pressure is always good. high stat press on the 20fpi is important and so is the amount air. stat press wont matter as much on the 8fpi as long as the fan has a high cfm.
my bgears are kinda noisy compared to the yate low speeds i use now.
my next fans will be either gt ap-15(or 14) or swiftech rdm125s. they will be on a fan controller so noise wont matter as much to me because they are both quiet. will probably save the money and buy the $6 fans...
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post #6 of 7
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Quote:
Originally Posted by pc-illiterate View Post

static pressure is always good. high stat press on the 20fpi is important and so is the amount air. stat press wont matter as much on the 8fpi as long as the fan has a high cfm.
my bgears are kinda noisy compared to the yate low speeds i use now.
my next fans will be either gt ap-15(or 14) or swiftech rdm125s. they will be on a fan controller so noise wont matter as much to me because they are both quiet. will probably save the money and buy the $6 fans...

Thanks mate, i was really worried on if the 30cfm was a +/- to having 1.00mmH2O static pressure difference.

i just picked up 2 of the blade masters seeing as they are 600-2000rpm and can offer up to 3.9mm on 2k rpm, the bgears seemed nice but 2000rpm constant might be an issue if i want to crank it down to 1500rpm and i cant

In your experiences, would you say the 30CFM outweighs the 0.9mmH2O static pressure lost in a situation like blade master vs b-blasters?
  
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post #7 of 7
i ran the bgears on my 240 as i said. they were just plain loud. they dont actually get as quiet as my excalibers do. the blade master is almost the same as the 212+ stock fan. its kinda quiet as pushing enough air to matter. theres better but, you know.
do you want good quiet fans or do you want to say, look at my fansez! they are teh 1337! these, http://www.swiftech.com/fan120x25mmrdm1225s.aspx are great fans. their problem is they have sleeve bearings and are loud at full speed. buy a fan controller to get them to 1600rpm. ball bearings still make a noise just a different noise. with sleeve bearings, they wear out and need to be replaced. at $6 per fan, replace them every other year and you still buy 3 fans(6 years) for what you pay for 1 ap-15. something else might come along that does better quieter.
i use yate loon 1350rpm fans. they are very quiet on my 12fpi rads. i might go to xspc or yate loon 1650rpm fans once i add my gpu blocks and maybe another rad. cheap and still kinda quiet.
i dont know, im rambling adding more than 2cents.gif worth

*edit* doesnt your mobo control fan speeds on the 3pin fan headers? i know mine does.
Edited by pc-illiterate - 3/26/13 at 8:33pm
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