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Fink Angel
Caldari
The Merry Men
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Posted - 2007.10.02 13:46:00 -
[1]
I've just replaced my old Athlon CPU heatsink the same way around as the original, and I had a thought ... "hold on a second, that's sucking the air OFF the heatsink".
Have Googled a bit and seen conflicting opinions on this, so thought I'd ask the Eve community which way their CPU fans run.
A) Blow air down onto the CPU
B) Suck air upwards from the CPU
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Rizlovf
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Posted - 2007.10.02 13:51:00 -
[2]
Hmm funny, mine blows trough it >< haha.
Generally the newest fans have a system so that the air blown goes directly out of the case. (generally it has a vertical heatsink with a fan attached that blows air trough it to the back of the case, where obviously most cases have a fan which suck air out.)
Eventough on your system I would want it to suck air onto the heatsink, and thus blow.
Option A
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Rialtor
Amarr
Yarrrateers
Mass Destruction.
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Posted - 2007.10.02 13:54:00 -
[3]
 Originally by: Fink Angel
I've just replaced my old Athlon CPU heatsink the same way around as the original, and I had a thought ... "hold on a second, that's sucking the air OFF the heatsink".
Have Googled a bit and seen conflicting opinions on this, so thought I'd ask the Eve community which way their CPU fans run.
A) Blow air down onto the CPU
B) Suck air upwards from the CPU
You just want a good air flow, mine for example runs across. So heat can be transfered from the hs to the air and out of the computer.
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Sokratesz
Paradox v2.0
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Posted - 2007.10.02 14:07:00 -
[4]
If its atop, blow, always.
If its on the side somehow, you probably bought a thermaltake product and need to be shot on sight.
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Sharupak
Minmatar
Knights Of the Black Sun
Rule of Three
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Posted - 2007.10.02 14:18:00 -
[5]
Originally by: Sokratesz
If its atop, blow, always.
If its on the side somehow, you probably bought a thermaltake product and need to be shot on sight.
Really, I always though my thermaltake stuff did a pretty good job. Although strangely, I have never used any of their cpu coolers. I definately think their cases are fantastic!
I found a pretty sweet cooler. Linkage
Its not the best cooler I have owned, but its only 30 bucks, dead silent, and keeps my DC pentium (I have one of those mega hot first generation dual cores) at around 45C.
To the OP. Either way works. There are designs that do effective cooling either way. The design of the heatsink is a little different between suck and blow. The important part is that air is moving over the fins for convection the only difference between them is the direction of the airflow.
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RuntimeError: ChainEvent is blocking by design, but you're block trapped. You have'll have to find some alternative means to do Your Thing, dude. |
Scorpyn
Caldari
Infinitus Odium
The Church.
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Posted - 2007.10.02 14:46:00 -
[6]
The first CPU fan I saw was aimed away from the heatsink. The replacement I got later was aim towards it, which made me believe that there was something wrong with it.
Anyway, in most cases it should blow air down towards the cpu. In the other cases it's probably someone who thought the logo on the fan should be visible, thereby making the air go in the wrong direction.
2007-07-19 20:26
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Vari
Carbide Industries
R i s e
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Posted - 2007.10.02 17:07:00 -
[7]
It depends on the heatsink but in almost all of the cases I've seen if the CPU cooler has only one place to put the fan you want BLOW
This is the advice of a 10-year PC builder
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aeti
Band of Brothers
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Posted - 2007.10.02 20:13:00 -
[8]
you have to remember, that they also cool all the components around the cpu as well, hence the sucking
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Surfin's PlunderBunny
Minmatar
mUfFiN fAcToRy
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Posted - 2007.10.02 20:36:00 -
[9]
We're talking about CPU fans sucking and blowing... damn, we're lame 
Originally by: Liz Kali
Tic Toc Tic Toc , time is ticking
Originally by: TheDagda
*click*
For the love of the jovians stops necroing
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Akita T
Caldari Navy Volunteer Task Force
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Posted - 2007.10.02 21:06:00 -
[10]
Edited by: Akita T on 02/10/2007 21:13:30
BLOWING air into the sink is usually slightly more effective (not always).
The air is slightly hotter near the motherboard than in front of the fan, so the thermal difference is in your favor for "blowing"... the heatsink material has a much better heat transfer capacity, so wether you cool the "tip" or the "base" doesn't really matter all that much.
But to be honest, the difference is negligible either way.
You also get slight cooling to the motherboard components, but one could argue that since you blow hot air, it might actually have the opposite effect (so "sucking" fans might again be better).
The only ownside of "blowing" air into the sink is that dust tends to settle on the heatsink faster.
So, in case you're not going into the case cleaning it, and you don't have a case with a dust filter, a fan that SUCKS air out of the sink is definetely the better option, long-term.
There's also the positioning of the CPU/board.
Most desktops have a vertical placement, fan sucks/blows horizontally, doesn't make a difference.
Some have a horizontal mobo and/or CPU placement, so the fan moves air vertically... here, you usually want a fan that "sucks" air out of the sink and throws it "upwards".
Bottom line ?
Doesn't matter all that much 
_
Caldari N.V.T.F. is recruiting... |
Derovius Vaden
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Posted - 2007.10.02 21:16:00 -
[11]
I'm of the opinion that sucking hot air up from the CPU and expelling it up above the sink is more efficient than blowing air down from above to displace the hot air around the CPU.
My reasoning is as follows:
1. By sucking the hot air up and away, there less hot air being recycled across the sink, where as if you blow down onto it, the flow of the air curls back up from the CPU and into the intact on the fan. Thus, you are blowing the air you just displaced back at the fan.
2. The density of hot air is less than the density of cold air; this encourages, as we all know, for hot air to rise. By bringing this hot air to its desired location, ontop of the cold air, there is less natural convection back down onto the CPU.
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Shalia Ripper
Caldari
High4Life
SMASH Alliance
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Posted - 2007.10.02 21:59:00 -
[12]
It really doesn't matter. Your fan is not cooling the CPU, it is cooling the heatsink ATTACHED to the CPU. So as long as there is airflow through the fins of the heatsink and you have a good thermal exchange between the CPU and heatsink, you are fine.
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Derovius Vaden
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Posted - 2007.10.02 22:02:00 -
[13]
Originally by: Shalia Ripper
It really doesn't matter. Your fan is not cooling the CPU, it is cooling the heatsink ATTACHED to the CPU. So as long as there is airflow through the fins of the heatsink and you have a good thermal exchange between the CPU and heatsink, you are fine.
It does matter. So long as there is convection and natural movement of air inside the given space, flow is relevant. If you could somehow stagnate the air, than you'd be right.
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Shalia Ripper
Caldari
High4Life
SMASH Alliance
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Posted - 2007.10.02 22:39:00 -
[14]
This thread both suck AND blows.
P.S. My CPU cooler blow horizontal to the MB.
One benefit to a downward facing airflow is cooling the board around the CPU...although how useful this is yet to be determined.
P.S. Devorius gets a "FAIL" in reading comprehension.
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Mudkest
MetaForge
Ekliptika
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Posted - 2007.10.02 22:46:00 -
[15]
heh, reminds me of a "conversation" I had with someone last. Complained about how her computer sucked, so I told her to turn the fans around. got a "wtf are you on about" look, so I explained that if she did that her comp wouldnt suck anymore. It would blow instead.
had to dodge some pillows after that though
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GIEV custom ship paint jobs!
I want my hello-kitty-kessie! |
Sharupak
Minmatar
Knights Of the Black Sun
Rule of Three
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Posted - 2007.10.03 03:21:00 -
[16]
Some of you should read this!
Linkage
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RuntimeError: ChainEvent is blocking by design, but you're block trapped. You have'll have to find some alternative means to do Your Thing, dude. |
Wrayeth
Shiva
Morsus Mihi
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Posted - 2007.10.03 04:08:00 -
[17]
Originally by: Rialtor
Personally I like sucking as opposed to blowing
Sig-worthy.
-Wrayeth
n00b Extraordinaire
"Look, pa! I just contributed absolutely nothing to this thread!" |
Sister Impotentata
Caldari
State War Academy
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Posted - 2007.10.04 00:28:00 -
[18]
Simply put, the amount of cooling is roughly proportional to the number of particles of coolant (molecules of air) brought into contact with the area of the convector (heatsink).
Assuming equal flow rates in either direction (suck or blow):
With a suck configuration (fan drawing air through the heatsink) you are creating a lower-than-ambient pressure everywhere between the blades of the fan and the openings of the heatsink. The air that is actually contained within the heatsink-fan complex at any given time is less dense than that of ambient air, and as such has less heat capacity per volume than ambient.
With a blow configuration (fan pushing air through the heatsink) you are creating a higher-than-ambient pressure everywhere between the blades of the fan and the openings of the heatsink. The air that is actually contained within the heatsink-fan complex at any given time is more dense than that of ambient air, and as such has more heat capacity per volume than ambient.
That having been said:
If my fan were mounted directly atop the heatsink, as is common, I would prefer a suck configuration. Here's why:
In a blow configuration, with a bladed fan mounted bare millimeters above a static, flat-bladed heatsink, you don't get air flowing smoothly off the fan and through the heatsink. You've got a stator-rotor configuration with air bouncing around in eddies from fan-blade to heatsink-fin and back again. It's a torque-converter permanently stalled, blowing a whole lot of nowhere. So with fan-over, go suck.
If I had a remote source of air, however, like one of these in the basement with air ducted up into my case, I'd go blow. I'm not saying I have that or anything, though.
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TANSTAAFL
Originally by: Hostess
Deconstructing the Twinkie is like trying to deconstruct the universe.
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Sharupak
Minmatar
Knights Of the Black Sun
Rule of Three
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Posted - 2007.10.04 01:22:00 -
[19]
Originally by: Sister Impotentata
Simply put, the amount of cooling is roughly proportional to the number of particles of coolant (molecules of air) brought into contact with the area of the convector (heatsink).
Assuming equal flow rates in either direction (suck or blow):
With a suck configuration (fan drawing air through the heatsink) you are creating a lower-than-ambient pressure everywhere between the blades of the fan and the openings of the heatsink. The air that is actually contained within the heatsink-fan complex at any given time is less dense than that of ambient air, and as such has less heat capacity per volume than ambient.
With a blow configuration (fan pushing air through the heatsink) you are creating a higher-than-ambient pressure everywhere between the blades of the fan and the openings of the heatsink. The air that is actually contained within the heatsink-fan complex at any given time is more dense than that of ambient air, and as such has more heat capacity per volume than ambient.
That having been said:
If my fan were mounted directly atop the heatsink, as is common, I would prefer a suck configuration. Here's why:
In a blow configuration, with a bladed fan mounted bare millimeters above a static, flat-bladed heatsink, you don't get air flowing smoothly off the fan and through the heatsink. You've got a stator-rotor configuration with air bouncing around in eddies from fan-blade to heatsink-fin and back again. It's a torque-converter permanently stalled, blowing a whole lot of nowhere. So with fan-over, go suck.
If I had a remote source of air, however, like one of these in the basement with air ducted up into my case, I'd go blow. I'm not saying I have that or anything, though.
.......................................................... So, how about those dodgers!
Just kidding, I am fearfull of my brain holding that kinda information because if something goes in, something important may fall out LOL!
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RuntimeError: ChainEvent is blocking by design, but you're block trapped. You have'll have to find some alternative means to do Your Thing, dude. |
Fink Angel
Caldari
The Merry Men
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Posted - 2007.10.05 18:14:00 -
[20]
Thanks for all your responses. If anyone is interested I found this real world overclockers test showing "no fan / blow down / suck up"
http://www.solarwarp.net/rss.php?c=136&s=H&p=21
It's a long page and shows CPU temps near to the top.
Having no fan makes it really hot as you'd expect, but the suck / blow difference is really minor, with "blow" just winning a little.
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Kirjava
Lothian Quay Industries
Zzz
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Posted - 2007.10.05 19:31:00 -
[21]
For some reason my mind ommited the "CPU fan" part of the title and I immediatly dashed in here to see wtf this thread was about.
Your cunning ploy to lure me into this thread succeded, kudos.
Originally by: CCP Morpheus
Post with your alt.
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me bored
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Posted - 2007.10.06 04:15:00 -
[22]
The whole suck/blow debate is more about case mounted radiators than anything else.
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Imperator Jora'h
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Posted - 2007.10.06 05:15:00 -
[23]
Doesn't really matter:
Quote:
Thermalright assures us that cooling is the same with the fan blowing up or down.
SOURCE: http://www.silentpcreview.com/article194-page2.html
I suppose you might give consideration to how the air is flowing through your system and where other heat sources are dumping their heat for optimal performance (different direction may be better in different cases) but by itself the heat sink doesn't care.
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