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Suck Or Blow? Get Yer Minds Outta The Gutter!

post #1 of 9
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Last night I was cleaning out my case and started to wonder if it's best for the fan mounted on your heatsink to blow air onto or pull air away from the the CPU in order to get better cooling?

On other message boards there seems to be some debate.

On the one hand you have cooler air being put directly onto the heatsink, which should logically provide a lower over all temperature provided you have a way for fresh air to be brought in either through vents or an additional fan. The problem with this is that it could potentially mess up the air flow in the case by pushing the air down and away causing some turbulence.

Another question that I have about that method would be whether or not an intake and exhaust fan would cancel out any turbulence?

If you look at it the other way you are drawing the warm air away from the heatsink, potentially preserving the airflow meaning you are bringing additional cool air from the intake.

This all came about because my OCZ Tempest pulls air away from the heatsink and that air is further blown out of the case by another fan on the side. For kicks I switched it around to blow air onto the heatsink and found the temperature dropped about 2 degrees but it looks friggin' ugly because of the way the LED's and sticker are placed leading me to believe that it was set up to pull the air away.

I'm curious to see what the rest of you think...and I'm drying to dodge doing any work.
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post #2 of 9
Blow down is the best way.

With heatpiping it is impossible to mount a fan on the botton and routing the heatpiping on top, it just takes up too much room to be practical. Also the air being blow has much more force than air being pulled in, that way air is hitting the motherboard components from the blowing fan is more greater velocity.
    
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post #3 of 9
Correct term is PUSH or PULL. There has been some debate over this even in the watercooling section (over Radiator Fan Placement). I think for all situations, it is best to PULL or PUSH cool air into a HOT object.
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post #4 of 9
ive done something last winter with my old rig.. and noticec at 10 degree celsius ambiant that pushing and letting nothing go out got me 5 degree's less so trial and error on fan placement and method but your best bet is to use the front panel to get air in and get the back of the case to make it exit ill post a case mod thread next month when ill get my cutting tools
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post #5 of 9
Blow...

If you blow, cold air enters the fins. It is coldest as soon as it enters but heats up as it reaches the bottom and most hot fins. So cold air is the air doing the cooling.

If you suck, you're taking HOT air from the bottom of the fins and using that hot air to cool the upper, cooler fins...that doesnt sound right now does it?
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post #6 of 9
Blow, because when you suck, some of the air thats being sucked in is from the side that its blowing out. Not all the air being blown out is sucked in from the other side.
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post #7 of 9
blow. not only will it cool your heatsink better, it will also cool the NB and VRMs better. many of us now have HSFs that blow backward anyway, making it a moot point.
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post #8 of 9
You want to be pushing air through the fins
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post #9 of 9
Quote:
Originally Posted by trueg50 View Post
Blow down is the best way.
lawl lawl lawl lawl
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