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question about "arctic fan 12"

T

tqner

n00b
Joined
Jul 15, 2006
Messages
49
hello,

my question is,
if i'll attach this fan to my radiator, it will throw air into the rad, or pull the air outside the rad?


thanks alot!

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acquetd5.jpg
 
NewEgg Link

It looks to me like it would be pushing air through your rad - not necessarily the best setup. Word on the street is that push and pull get you the same temps, with pull being a little quieter due to it creating less air turbulence.
 
from my simple test, push air was much more quiet.
about the performence, i didnt see any difference.
 
By taking the shroud off the fan, they can make a fan that pushes a lot of air very quietly. If that's all there is to the story, then why aren't all fans unshrouded? What's the deal with putting the blades inside that useless tube? There has to be more to the story...

Unshrouded fans are great at moving a lot of air - in the open (i.e. at or near 0 pressure differential between the front and the back). Putting fan blades inside a shroud cuts down on the total air moved at 0psi differential, but it lets the fan move a lot more air when pushing against a pressure differential. If unshrouded were the best solution for all fan applications, then why are all the jet engines in the world shrouded? It's not a big conspiracy; it's because they are using their fans to generate a high pressure differential.

Think of a fan as a water pump. unshrouded fans are basically high flow/low head pumps. Shrouded fans push less flow at low/no head, but more flow against a higher head resistance.

So what does this have to do with watercooling? It turns out that radiators don't like to have air move through them - especially high FPI radiators, and thick ones like the BIX. There is a pressure differential generated when you push (or pull) air through a radiator. How big it is, or how significant it is I don't know. But until fan reviewers start publishing CFM/pressure differential data, I'm sticking with shrouded fans for radiator duty.

For general case fan use, the AF12 might be the greatest thing in the world. But for radiators, probably not.
 
thanks alot!!!

so what is you'r recommendation ?


arctic cooling "af12025" will be better for rads ?
 
Unless you need the most blingtastic fan out there, you can't really go wrong with the $4 yate-loons at jab-tech ($3.49 if you buy 3 or more). Hella bang for your buck.

There are quieter fans out there, but usually not for less than 3-4x the cost.

edit: But to answer your question, yes the af12025 will be a lot better for a radiator. (And it's not that expensive either.)
 
If availability is an issue, the AF12025 looks good to me. They don't push a huge amount of air, but ~25dba is very quiet, and I think you'll be happy with them.
 
are you sure that 25dba is quiet enough ?
i have an old 80mm fan (cooler master led) with 25dba, and his noise insufferable...


thanks again :)
 
25db of noise is very good for a fan. I've never used these before so I can't comment on their noise/performance ratio... however.
 
nonlnear said:
By taking the shroud off the fan, they can make a fan that pushes a lot of air very quietly. If that's all there is to the story, then why aren't all fans unshrouded? What's the deal with putting the blades inside that useless tube? There has to be more to the story...

Unshrouded fans are great at moving a lot of air - in the open (i.e. at or near 0 pressure differential between the front and the back). Putting fan blades inside a shroud cuts down on the total air moved at 0psi differential, but it lets the fan move a lot more air when pushing against a pressure differential. If unshrouded were the best solution for all fan applications, then why are all the jet engines in the world shrouded? It's not a big conspiracy; it's because they are using their fans to generate a high pressure differential.

Think of a fan as a water pump. unshrouded fans are basically high flow/low head pumps. Shrouded fans push less flow at low/no head, but more flow against a higher head resistance.

So what does this have to do with watercooling? It turns out that radiators don't like to have air move through them - especially high FPI radiators, and thick ones like the BIX. There is a pressure differential generated when you push (or pull) air through a radiator. How big it is, or how significant it is I don't know. But until fan reviewers start publishing CFM/pressure differential data, I'm sticking with shrouded fans for radiator duty.

For general case fan use, the AF12 might be the greatest thing in the world. But for radiators, probably not.
Click to expand...


I can agree with this. I've used both the AF12 and the 12025 on a 240mm radiator and had better results with the 12025.
 
forget about the thermaltake.. They say 62cfm, 16db. That's about as wrong as saying thermaltake watercooling is good. Here, have a Seat \_ and let me tell you how they rate.

Some companies, such as Nexus, or Yate Loon, rate properly. Put the fan in a soundproof chamber, measure from a specified distance, and then record what they measure and how far away, honestly.

Then there are companies which make fans, record the Db, and while their fans have clicking and buzzing noises, they are rated as reletivly quiet, even if they are slightly louder and buzz and click.

And then we have the outright liars. Thermaltake, SilenX, the vast majority. Their fans click, buzz, and the db scales they use are totally off, such as measuring the fan from 10 meters instead of 1, or something else.


The Yate Loon's are your best friend. Quiet, moves enough air, and dirt cheap.
 
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