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Rad fan choice

post #1 of 14
Thread Starter 
I have Noctua NF-A14 FLX on my Koolance 280mm 30fpi rad on top of my H440 pulling out air. After playing around with my CPU, I realized I didn't have enough air coming out from the vent holes.

Would anyone recommend a high 140*140*25mm static pressure fan that will out perform my Noctua in terms of either performance or quietness.
post #2 of 14
Quote:
Originally Posted by GhostHitWall View Post

I have Noctua NF-A14 FLX on my Koolance 280mm 30fpi rad on top of my H440 pulling out air. After playing around with my CPU, I realized I didn't have enough air coming out from the vent holes.

Would anyone recommend a high 140*140*25mm static pressure fan that will out perform my Noctua in terms of either performance or quietness.

What other fans do you have? What is the total CFM intake and the total CFM exhaust for your case? Intake CFM and exhausr CFM should be about equal. Perhaps you have your fans working against each other.

There are quieter fans but they won't have as much pressure. There are fans with more pressure, but they won't be quieter. Which do you want?
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post #3 of 14
Thread Starter 
Quote:
Originally Posted by billbartuska View Post

What other fans do you have? What is the total CFM intake and the total CFM exhaust for your case? Intake CFM and exhausr CFM should be about equal. Perhaps you have your fans working against each other.

There are quieter fans but they won't have as much pressure. There are fans with more pressure, but they won't be quieter. Which do you want?

Thx for reply, I have a EK PE360 in take in front, pushing with Corsair SP120 high performance.
Only one exhaust at rear also the SP120 high performance.
All the SP120 run from 1500~2100 rpm. Could get a little bit noise. My noctua run at 1200 rpm constant.


The reason why I have this problem is that after I take off the top and front panel of the H440 while prime95, avg temp drops from 85c to 75c and max from 92c to 86c.

My hope is, since I still have room to run push-pull in front, I'll use GT AP-13 or NB eLoop B12-3 pushing, and only enable SP120 pulling when needed. But I have no idea what to do with the top 280mm. I have no room for push-pull at top.

I don't mind either, since I will definitely run them at different speed when needed. If one fan can outperform the Noctua NF-A14 I will consider it.
post #4 of 14
Fan RPMs don't tell you nothing about how much air the fan is pushing. CFMs?

If cooler with side panel removed it means you have a fan problem.
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post #5 of 14
Thread Starter 
Quote:
Originally Posted by billbartuska View Post

Fan RPMs don't tell you nothing about how much air the fan is pushing. CFMs?

If cooler with side panel removed it means you have a fan problem.

That's exactly what this post is about.

I mention RPM as reference of noise. read from martin's liquid lab it's about 50~56dBa the SP120

I don't know how much cfm is actually generating through the rad since the box spec only provides under 0 restriction right?
How do I calculate it precisely?

Intake:
SP120 is 62.74 CFM. 62.74*3=188.22 intake.

Outtake:
NF-A14 is 68 CFM. (68*2)+62.74 = 136+62.74 = 198.74 outtake.
Edited by GhostHitWall - 10/12/14 at 10:56am
post #6 of 14
What are the other parts in your loop and system?

Either way, I'd suggest against mixing fans in push pull, they're just going to end up working against one another.
 
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post #7 of 14
These fans have good static pressure, they're one of the best for 140mm radiators.

http://www.akasa.com.tw/update.php?tpl=product/product.detail.tpl&no=181&type=Fans&type_sub=PWM%20Control&model=AK-FN063
post #8 of 14
Quote:
Originally Posted by GhostHitWall View Post

I don't know how much cfm is actually generating through the rad

Here's some data:
Higher pressure fans loose, percentage wise, less air through a rad.



PercentCFMThruRad.xlsx 21k .xlsx file
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post #9 of 14
Thread Starter 
Quote:
Originally Posted by deafboy View Post

What are the other parts in your loop and system?

Either way, I'd suggest against mixing fans in push pull, they're just going to end up working against one another.

Two 780ti and the 4790k.

I won't mix them at two sides of the rad. like the in a 360mm, the top and middle 120mm with lower noise fan. the bottom 120mm with SP12. I think this wouldn't hurt any performance.
Quote:
Originally Posted by Duality92 View Post

These fans have good static pressure, they're one of the best for 140mm radiators.

http://www.akasa.com.tw/update.php?tpl=product/product.detail.tpl&no=181&type=Fans&type_sub=PWM%20Control&model=AK-FN063

Thanks, they seem to be pretty good as what I probably need.

Quote:
Originally Posted by GhostHitWall View Post

Two 780ti and the 4790k.

I won't mix them at two sides of the rad. like the in a 360mm, the top and middle 120mm with lower noise fan. the bottom 120mm with SP12. I think this wouldn't hurt any performance.
Thanks, they seem to be pretty good as what I probably need.

Quote:
Originally Posted by billbartuska View Post

Here's some data:
Higher pressure fans loose, percentage wise, less air through a rad.



PercentCFMThruRad.xlsx 21k .xlsx file


Thanks for the input, I see what you are saying now. But that means I need to find ppl who have done the test with exact same fan and case I have?

I can find how restrict my rad and how strong the fans are, but how do I know how much air lost when the panel is on compare to when it's off?
Edited by GhostHitWall - 10/12/14 at 3:22pm
post #10 of 14
Quote:
Originally Posted by deafboy View Post

What are the other parts in your loop and system?

Either way, I'd suggest against mixing fans in push pull, they're just going to end up working against one another.

Actually mixing fans in push-pull isn't a big deal. @Martinm210 (of martinsliquidlab) even encourages it:
Quote:
Originally Posted by Martinm210 View Post

Absolutely, I encourage mixing of fans and have done it many times. The mixing fan phobia generate by forum members is really just another forum myth by users not knowing. I have yet to see any testing to show it being a problem. Actually I have found mixing two different fans to be a benefit at times. When testing the H220 I found two AP15s plus two Helix to be a great match. The helix alone seemed to have a little harmonic under pressure in push only that goes away and smooths out when the GTs were added. Also anytime you mix like fan speeds you can get rpm harmonics so having fans at speeds that are a few hundred off is a good thing.

Noctua even does mixing of fans and speeds on their NH-D14.

While it may not make sense to mix 5000rpm Deltas with 1200rpm yates, I sure wouldn't worry about 500rpm differences particularly when resistance like a radiator is keeping air flows well below either fans max air flow rate. Mixing fans is a good thing..smile.gif
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