[Adagio]

Hi,

I own a Alpha PAL 8045 heatsink, and I would like to know how to attach the fan on it - sucking or blowing?

Sorry for my english

[INFERNO2000]

blow

[Palos]

If you look at the small leaflet you got with it (if you got any), you'll see how it's done.

Otherwise look on the base of the fan, you'll see the arrows one has to point up/down the other left/right. You figure out the airflow from that...

[Adagio]

I wanted to know how to get the best cooling results - with a sucking or blowing fan. I know in what direction the fan works

[CrazyKillerMan]

Blowing.

[Palos]

Wait a minute...
Depending on the positioning of the fan, blowing and sucking can mean the same thing, lol.

By blowing y'all mean blowing INTO the heatsink, sucking from air

OR

Blowing into the air, sucking from the heatsink...?

Clarify this matter.

[Adagio]

Yeah, this is what I ment

Ok, what's best - blowing into the heatsink or sucking?

[Xiven]

Sucking from the heatsink is best.

[CrazyKillerMan]

sucking from the heatsink doesnt make sense though

1) Why dont all cooling company's do this if it was so?

2) The only part that is gonna get air movement is the top of the fins. If you blow air onto the heatsink, it will hit top of fins and down to the core area.

[Xiven]

1) They do. Every HSF I've seen sucks air from the heatsink and blows it out.

2) If you blow air onto the heatsink, you're blowing the hot air around the heatsink nearer to the processor. If you blow air away from the heatsink, you're blowing the hot air directly away from the processor, and colder air will be drawn in through the fins.

[CrazyKillerMan]

I have a dragon orb 3, jmc arctic wind plus, and a volcano 6cu+....they all blow onto the heatsink.

Quote:

2) If you blow air onto the heatsink, you're blowing the hot air around the heatsink nearer to the processor. If you blow air away from the heatsink, you're blowing the hot air directly away from the processor, and colder air will be drawn in through the fins.

You can alos say, why take hot air from bottom of proc, and make the fins hot???

Everyheatsink I have ever seen has blown onto the heatsink.

ie: Leadtek gf2pro. Blows onto the heatsink and cools ram at the same time by taking the air from the fan and redirecting it to memory heatsinks.

My asus a7m-266 has a chipset fan, it blows air onto the heatsink. As stated above, they all blow onto heatsink.

Gateway 1600 (old as hell) blows onto the heatsink.

And....there is only one way one can put a fan onto the mobo ... the only way the header allows.

[CrazyKillerMan]

lol

I jsut read somewhere that alpha heatsink blow away from heatsinks, while all others blow on the heatsinks.

Xiven ... where u refering to just alpha's???

[Adagio]

This is written on Alpha's website:

Quote:

According to our tests, the induction type showed better results the the expulsion type. This is because we used an intake cover to draw air through the lower part of the heat sink for more heat dissipation from the lower part of the fins. However, if some other heat source is located near the heat sink, heated air would come into the heat sink and affect the thermal performance, so the choice must be made depending on the environment.

My english isn't that good - what does that mean? Is it better to blow into the heatsink, or the other way round? ;(

[Palos]

LOL, back where we started from...

[CrazyKillerMan]

Quote:

This is because we used an intake cover to draw air through the lower part of the heat sink for more heat dissipation from the lower part of the fins.

OK, now this makes sense. If you have one of these "intake covers" to focus airflow at the base, then suck from the heatsink. If not, the way I look at it, all of the air flow would be mainly focused on the upper part of the fins, and the lower part would not get as much attention. But if you were to blow on the heatsink without the cover, this would focus on the base, which is good for heat dissipation. If you have an intake cover, blowing may harm performance as there would be alotta turbulence at the bottom.

[Xiven]

Well that would explain the confusion we are getting here

[CrazyKillerMan]

indeed
:p

[three]

hmm..sucking air from the heatsink would shorten the lifespan on the fan wouldn't it? I mean, the heat that is sucked thru the fan would not help cool the friction of the bearings. Just a thought.

[Adagio]

Ok, I turned my fan so that it sucks air from the heatsink ... the result: my cpu is 4-5 degrees cooler than before (32 degrees/idle, 51 degrees full load).

Btw, I'm using a superquiet Pabst fan (12 dB!) ...