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SP or AF intake

Ilias Velaoras
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I was considering getting the CM Silencio 452 case for my new computer (I want to have a quiet case because i will be sitting literally right next to me all the time)

I heard that the stock fans are bad and the intake is kinda limited so i want to get better fans but my question is which kind of fan would benefit in a limited intake? 

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I was considering getting the CM Silencio 452 case for my new computer (I want to have a quiet case because i will be sitting literally right next to me all the time)

I heard that the stock fans are bad and the intake is kinda limited so i want to get better fans but my question is which kind of fan would benefit in a limited intake? 

will there be hard drive cages in front of the intake fan? if so, a static pressure fan is better.

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@IliasVelaoras Make sure you "follow" you own posts so you know when people reply.

 

Go with SP fans. The intake isn't "restricted", per se, but it's not wide open like on a HAF series case. That, coupled with the drive cages being right there, points to a SP setup. As a general rule, you can use SP fans everywhere in a case. When comparing AF vs SP, in a completely open environment the AF fan will technically be able to move more air than an SP, but as soon as you start adding resistance or obstacles in front of the fan, the SP fan will quickly catch up and even pass the AF fan in performance because it can push the air past/around obstacles. And, let's be honest, there is no such thing as a computer case with a completely open environment. ;)

 

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Static pressure, all the time no question about it. There's no reason to ever get an AF branded fan.

My chassis has a place for exhaust fan and it doesn't have any fan grill or dust filter or anything. Tell me, why would I not put air flow oriented fan in that spot?

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My chassis has a place for exhaust fan and it doesn't have any fan grill or dust filter or anything. Tell me, why would I not put air flow oriented fan in that spot?

Because the difference between and AF branded fan and SP branded fan is how much air they move. SP is better for moving air in every single situation. It moves air in one direction instead of being a "Bleh" approach of moving air everywhere.

.

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Static pressure, all the time no question about it. There's no reason to ever get an AF branded fan.

Fans more oriented towards airflow as opposed to static pressure tend to be quieter. 

If you ever need help with a build, read the following before posting: http://linustechtips.com/main/topic/3061-build-plan-thread-recommendations-please-read-before-posting/
Also, make sure to quote a post or tag a member when replying or else they won't get a notification that you replied to them.

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Just my 2 cents.... If the air from the intake side of the fan is unrestricted (in other words nothing close to it blocking air coming in) then an airflow fan is going to be better than a static pressure fan. An airflow fan with a high CFM (Cubic feet per minute) will move more air than an SP fan in the same place of unrestricted airflow. SP fans however, will work better in tight spots and move the air more directionally, hence why you place them on RADs because you want the air to blow on the rad directly. Therefore an exhaust fan needs to be an AF fan due to its CFM which mean its gonna move more of that hot air out of the case faster.

 

In a nutshell It's a simple case of deciding where you want the air to go. If you are trying to cool a radiator, then SP because its flow is directional and will blow more "straight" directional air. An AF fan which brings in more air but blows it out in a wider area are suited for intakes on the outside of the case and exhaust because you want the AF fan to get hot air out and your are not worried where the fan blows it once it out of your PC.

 

Sorry for the long winded explanation but hope it helps you.

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Fan control happens to be a thing in 2015.

Rpm is arbitrary and airflow oriented fans are quieter while performing better where more static pressure isn't needed.

If you ever need help with a build, read the following before posting: http://linustechtips.com/main/topic/3061-build-plan-thread-recommendations-please-read-before-posting/
Also, make sure to quote a post or tag a member when replying or else they won't get a notification that you replied to them.

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I believe that AF fans should be better if you don't have much in front of your case. If you don't have a fatty radiator or a RAID setup with 10 hard drives in the front of your case & it's mostly OPEN, AF should be preferable. SP fans are mostly for radiators or when you need that extra pressure. 

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Because the difference between and AF branded fan and SP branded fan is how much air they move. SP is better for moving air in every single situation. It moves air in one direction instead of being a "Bleh" approach of moving air everywhere.

You're just wrong. What difference does it make for a exhaust fan where the air goes? It's still going out of the case. And AF fans will move more air than SP fans in open environment. Let's look at specs from Noctua site for example:

NF-F12

Airflow 93,4 m³/h

NF-S12A

Airflow 107,5 m³/h

The difference comes when you put something infront of the fan. For AF optimized fan, this drops the amount of air it can move a lot more than it does for SP fan. But as I said, in my case there isn't anything anywhere close the back fan. So there is no need for SP fan, the goal is just to move as much air out of the case as possible.

But to be honest I think even for intake fans, people shouldn't buy pure AF fans. Even fan filters create quite a bit of restriction so SP fans are justified.

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Rpm is arbitrary and airflow oriented fans are quieter while performing better where more static pressure isn't needed.

Who says all static pressure fans are loud?

 

You're just wrong. What difference does it make for a exhaust fan where the air goes? It's still going out of the case. And AF fans will move more air than SP fans in open environment. Let's look at specs from Noctua site for example:

NF-F12

Airflow 93,4 m³/h

NF-S12A

Airflow 107,5 m³/h

The difference comes when you put something infront of the fan. For AF optimized fan, this drops the amount of air it can move a lot more than it does for SP fan. But as I said, in my case there isn't anything anywhere close the back fan. So there is no need for SP fan, the goal is just to move as much air out of the case as possible.

But to be honest I think even for intake fans, people shouldn't buy pure AF fans. Even fan filters create quite a bit of restriction so SP fans are justified.

Air still has to come from somewhere but okiedokie then, lmao.

.

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Air still has to come from somewhere but okiedokie then, lmao.

So you're still saying that

"SP is better for moving air in every single situation"?

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Yeah sure, why not?

Well because it's not true? If the goal is to move as much air as possible and there are no restrictions for it, air flow oriented fans will do it better than pressure oriented.

Why would there even be AF fans if they are pointless?

The past cannot be altered. The present holds but regret and loss. It is only in the days to come that a man may find solace. When memory fades..
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Well because it's not true? If the goal is to move as much air as possible and there are no restrictions for it, air flow oriented fans will do it better than pressure oriented.

Why would there even be AF fans if they are pointless?

Nah, just because debates are meaningless on this forum so exchanging thoughts and opinions means nothing.

.

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Who says all static pressure fans are loud?

They're not all loud but are consistently louder than similar but airflow-oriented fans due to the nature of their design. 

 

Yeah sure, why not?

There's something called diminishing returns. Optimizing for SP usually means worse performance in a situation that doesn't need that much SP at the same noise level. The same goes for AF. There needs to be a bit of both and what balance of the two is optimal depends on the situation. Aerodynamics isn't exactly simple and there isn't a perfect fan. 

If you ever need help with a build, read the following before posting: http://linustechtips.com/main/topic/3061-build-plan-thread-recommendations-please-read-before-posting/
Also, make sure to quote a post or tag a member when replying or else they won't get a notification that you replied to them.

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