CPU Cooling Fan

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CPU Cooling Fan

Post by mel wilson » Mon May 18, 2009 2:50 pm

It may be obvious to some, but I would like to clear up an issue regarding the fan for the above, ......... Should it be drawing hot air away from the processor, or blowing cooler air onto it ?

Thanks

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Post by rd » Mon May 18, 2009 2:54 pm

Hey Mel, all the ones I've seen are suckers. Meaning they are pulling air in around the cooling media, and blowing/pushing it out.

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Post by mel wilson » Mon May 18, 2009 3:21 pm

Thanks RD, that was my thoughts also, just needed it clarified, thanks buddy.

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Post by tropicalfish » Mon May 18, 2009 9:58 pm

Like above, the air should blow into the heatsink.
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Post by Cat1 » Tue May 19, 2009 1:22 am

Doesn't terminology suck... Draw fan, pusher fan, suck fan, blow fan, intake fan, exhaust fan...

A short simple way to remember it...
If the heat source is below the fan, the fan is drawing/pulling air off the heat source. It is exhausting it into the surrounding air. Conductive/Convective cooling. Heat sync/fan

For the rest... Look here:

http://www.ocforums.com/showthread.php?t=287576
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Post by mel wilson » Tue May 19, 2009 1:25 am

Now I am confused.............. I'm not sure if I should spit or swallow [-X

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Post by Cat1 » Tue May 19, 2009 1:29 am

Hmmm...
My CPU fan seems to be "pulling" air down across the cooling fins.
I have no idea what I'm talking about.

Swish and puke?
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Post by mel wilson » Tue May 19, 2009 1:33 am

Ok........... Lets put it this way, should I be sucking hot air away, as RD suggests, or blowing cooler air down onto the heat scource ?

My first thoughts were with RD, the fan should be sucking hot air away from the heat scource.

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Post by rd » Tue May 19, 2009 2:04 am

It really depends on your case circulation, heatsink type, etc.

My new rig is actually pushing air into the cooling fins of the CPU. My old one was a "puller", as it had a shield around it to pull cooler air in, as close as possible to the CPU and heatsink rods.

If you can take a pic of your heatsink on the CPU, it will be easy to tell whether you should have a pusher or puller, sucker or blower.

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Post by tropicalfish » Tue May 19, 2009 2:13 am

Again, fan blows INTO heatsink. If the heatsink is against the motherboard, fan blows towards the motherboard. If it is a tower heatsink, the fan BLOWS THROUGH the heatsink, it does not suck through the heatsink.
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Post by rd » Tue May 19, 2009 4:20 am

tropicalfish wrote:Again, fan blows INTO heatsink. If the heatsink is against the motherboard, fan blows towards the motherboard.
That is not 100% correct.

As said, if the there is a manifold/cover over the heatsinks on the CPU, the fan is usually set up to PULL the air around the heatsink and exit through the fan.

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Post by tropicalfish » Tue May 19, 2009 4:45 am

rd wrote:
tropicalfish wrote:Again, fan blows INTO heatsink. If the heatsink is against the motherboard, fan blows towards the motherboard.
That is not 100% correct.

As said, if the there is a manifold/cover over the heatsinks on the CPU, the fan is usually set up to PULL the air around the heatsink and exit through the fan.

RD
I, honestly, have yet to find such a heatsink.
Take a look around frostytech.com They always blow into the heatsink.
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Post by rd » Tue May 19, 2009 6:52 am

Welcome to the real world called "REALITY". http://www.broadbandreports.com/forum/remark,8706632

I'm not trying to bust your balls, but not everything is as you read it.

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Post by tropicalfish » Tue May 19, 2009 9:52 pm

rd wrote:Welcome to the real world called "REALITY". http://www.broadbandreports.com/forum/remark,8706632

I'm not trying to bust your balls, but not everything is as you read it.

RD
Almost all stock heatsink and performance air heatsinks have the fan blowing INTO the heatsink.

Again, see diagram. Second one is a performance 120mm heatpipe heatsink.

Frostytech reviews all kinds of heatsinks, stock and high performance coolers. You'll find that they all have fans blowing into the heatsink.

As a little test for you, look inside your computer. Does it blow in at the heatsink, or does it blow away from the motherboard? If it blows towards the motherboard, try turning it so it blows away from the motherboard. You'll find that your temps will go up at least 15C.
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Post by rd » Tue May 19, 2009 10:23 pm

tropicalfish wrote:
rd wrote:Welcome to the real world called "REALITY". http://www.broadbandreports.com/forum/remark,8706632

I'm not trying to bust your balls, but not everything is as you read it.

RD
Almost all stock heatsink and performance air heatsinks have the fan blowing INTO the heatsink.

Again, see diagram. Second one is a performance 120mm heatpipe heatsink.

Frostytech reviews all kinds of heatsinks, stock and high performance coolers. You'll find that they all have fans blowing into the heatsink.

As a little test for you, look inside your computer. Does it blow in at the heatsink, or does it blow away from the motherboard? If it blows towards the motherboard, try turning it so it blows away from the motherboard. You'll find that your temps will go up at least 15C.
Like I said "Not all fans blow into the heatsink"

Otherwise, I am using this for cooling my CPU. Noctua NH-U12P SE1366 http://www.newegg.com/Product/Product.a ... _-35608007
With the 3.5Ghz OC, and running prime95 in blended mode for two hours, my temp is stable at 66C.

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Post by mel wilson » Tue May 19, 2009 10:30 pm

I'll post up a pic tomorrow, need to find a shovel first to clear away the dust pile from and around the fan........... lol

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Post by rd » Tue May 19, 2009 10:34 pm

Mel, you can tell if it is a pusher/puller by putting a piece of paper in the middle of the fan motor, and sliding it off towards the fan blades.

A 1cm by 5cm piece will work fine.

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Post by tropicalfish » Tue May 19, 2009 10:38 pm

In terms of computer heatsinks, almost all standard style heatsinks have the fan blow into the heatsink.

The Noctua one you have is in a push-pull configuration. If it was only one fan, the fan would be blowing into it.
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Post by rd » Tue May 19, 2009 10:42 pm

@ T-Fish....

Will you PLEASE, stfu. :D

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Post by tropicalfish » Tue May 19, 2009 10:44 pm

Ah fine.

Anyhow, a good way to see which way the fan blows is by looking at the blade curvature.

As you can see in this picture, the blades are curved so that it can pull air more effectively.

And, as you can see in that picture, the blades are curved so that it can push air just as effectively. If a fan pulls 100cfm, guess what??? It is also pushing 100cfm. As well, the curvature has no relation as to direction, only the efficiency of how much air it moves. Freaking physics 101. RD
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Post by mel wilson » Wed May 20, 2009 1:06 am

I am well aware of propwash direction, ie: pushing or pulling......... my problem is that the fan has been removed a number of times, for cleaning purposes, and can be put back on the heatsink both ways round, (you will see when I post the pics how easy it is to reverse) now for the life of me, I cant remember which way it was in the begining................. Bit like marrage really, what was it like all those years ago ! :roll:

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Post by tropicalfish » Wed May 20, 2009 1:10 am

It will be blowing towards the heatsink.
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Post by rd » Wed May 20, 2009 1:55 am

Ahhhh..... Now we get the whole story...LOL.

Yes, you want it blowing towards the heatsink and motherboard.

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