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Static Pressure Fans better at Airflow with Dust Filter? - Page 8

post #71 of 81
Quote:
Originally Posted by mtcn77 View Post

Okay, you have filled the starting point and the ending point of the line. Iterate more and compare their areas under the curve. In the end, you should reach some graph similar to this: Warning: Spoiler! (Click to show)

Sorry, I don't understood
Quote:
Originally Posted by mtcn77

It should always be a wise pick choosing a fan with regard to airflow versus static restriction graphs because air flow is constant per restriction.

The airflow/striction is not a constant ratio. AP-15 is 57cfm@2.0mm H2O & Cougar is 70.5cfm@2.2mm H2O, but when all data is graphed below; at 0.04"(1.0mm) H2O Cougar is 34cfm & AP-15 is 42cfm... 8cfm more than Cougar while specs show AP-15 having less performance by 13.5 cfm & 0.2mm H20. Of course as cfm increases so does resistance which give us the real world curve. wink.gif
http://martinsliquidlab.org/2013/02/18/why-static-pressure-max-flow-specs-are-poor-measures-of-fan-performance/
post #72 of 81
Grab a real delta and experience airflow with no divergence! biggrin.gif
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post #73 of 81
"Unit" air flow versus "percentage of restriction" is constant, what you are describing is "airflow variability across the restriction spectrum". It also varies across rotational velocity:

Force = mass x velocity
Power = Force x velocity
z(impedance) = force / velocity; so the more inertia a matter has, the slower it moves; hence we need a more powerful propulsion. Yet we need to restrict rotational velocity of the rotor because it is the major contributor of air pressure. In respective order, rotor torque is the second cause of noise which is heard as the unavoidable "hum".
You are a good show stealer, redundancy guy.thumb.gif
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post #74 of 81
Lowering the rpm also lowers the cfm and static pressure.
That's just common sense. wink.gif
How does that apply to OP's original question? :
But whatever. rolleyes.gif
Edited by doyll - 9/11/13 at 3:46pm
post #75 of 81
Quote:
Originally Posted by WuMyster View Post

Thank you for the info and a rep is well deserved. It seems that the majority believe that static pressure fans should be used and so that is exactly what I will do.
Now for the actual choosing of fans. I will downvolt fans to 7V temporarily for a few days until i get an aquero 5 in.
Would the GT AP-15 be the best choice? Corsair SP QE / PE?

In terms of raw performance of air flow vs noise, the GT AP15 will come on top. Truth be told, depending on your needs, you could consider the AP14, which is often only a degree or two warmer in exchange for quieter operation.
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post #76 of 81

In my previous rig I used a combination of two AP-14's on 5 Volts and one AP-12 on 12 Volts.

 

Five Volts was easy to get by swapping a wire in Scythe's Molex adapter. The AP-14 runs at 700-750 rpm at 5v. The AP-15 runs 750 rpm or so at 5v. The AP-12 runs 800-900 rpm at 12v.

 

These are my experiences with four AP-12's and six AP-14's. When a GT runs 700-800 rpm, it is nice and quiet while still moving air.

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post #77 of 81
Thread Starter 
Sorry for not posting. Been busy but have been reading all the posts!
I am sticking to the AP-15's since I have some spare and they are also what seem to be most recommended here and other places.
Ive been running them on 7V which was a bit loud for me. Tolerable, but loud. Ill try them at 5V when I get back to my PC!

Feel free to keep posting. Would like to learn your thoughts and gather more information!
post #78 of 81
Quote:
Originally Posted by ehume View Post

I'm a convert on higher static pressure fans pulling through filters. In my previous case I had two GT's in front.



So I decided to give this a try, swapped out my be Quiets for old Phanteks 140MP radiator fans I had lying around.

WOW.

Temps have plummeted to a point I did not think was possible. Motherboard maxes at around 40c now, and there's a 1080 ti on air at 2075 in there spewing a ton of heat. Ryzen 1700 at 3.8 never goes over 50. GPU cooling isn't as affected. To be fair the fans I was using were super quiet, but totally useless behind a filter. (Be Quiet Silent Wings 2.)

I am using an airflow case for exhaust, the Noctua A15 which has become my favorite exhaust fan. The 140MPs and the A15 make a killer combo, at around 1000rpm they are audible but not obtrusive at all, and inside an R5 under a desk, effectively silent.
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post #79 of 81
Quote:
Originally Posted by taem View Post

So I decided to give this a try, swapped out my be Quiets for old Phanteks 140MP radiator fans I had lying around.

WOW.

Temps have plummeted to a point I did not think was possible. Motherboard maxes at around 40c now, and there's a 1080 ti on air at 2075 in there spewing a ton of heat. Ryzen 1700 at 3.8 never goes over 50. GPU cooling isn't as affected. To be fair the fans I was using were super quiet, but totally useless behind a filter. (Be Quiet Silent Wings 2.)

I am using an airflow case for exhaust, the Noctua A15 which has become my favorite exhaust fan. The 140MPs and the A15 make a killer combo, at around 1000rpm they are audible but not obtrusive at all, and inside an R5 under a desk, effectively silent.
Your reply is rather typical from people who change their low pressure case fans to high pressure fans. Until recently most case companies supplied their cases terrible performing fans (Phanteks being the exception). fractal Design case fans are terrible. I don't know how good be quiet! case fans are but I suspect okay. Corsair cases come with terrible fans.
post #80 of 81
Quote:
Originally Posted by doyll View Post

Your reply is rather typical from people who change their low pressure case fans to high pressure fans. Until recently most case companies supplied their cases terrible performing fans (Phanteks being the exception). fractal Design case fans are terrible. I don't know how good be quiet! case fans are but I suspect okay. Corsair cases come with terrible fans.



I remember you mentioning the use of SP fans as intake case fans way back. Dunno why I didn't try til now. Probably because my results were acceptable using quiet case fans, because historically I go with budgetish gpu's. But I got a oc'd 1080 ti and omg does this thing boil my whole system. Motherboard temps were hitting 70c; I've never seen that before. So I needed to try something different and I remembered the point about SP fans.

The be Quiet! Silent Wing 2's are very nice fans, amazingly quiet, only fans I have ever used than can be considered truly quiet, almost silent, at 1000rpm. And without a filter, they actually move enough air to maintain a mainstream build. I love these fans and regret I can't use them, but they are not a good pairing with a top tier gpu. They would do just fine as exhaust fans in a quiet system I think, since that fan mount has the least amount of noise reduction.

You live in UK I think? If you lived in US I would send them to you for your knowledge base, they don't make these anymore I think.
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