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CPU Fan pushing or Pulling???

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Tech

Member
Joined
Aug 21, 2003
Location
Chicago
There is a lot of opinions on this but from what I've gathered from most of these type's of threads, it doesn't make a difference whether the fan pushes or pulls.
 

clocker2

Member
Joined
Dec 5, 2003
Location
Mile High
I believe that the fan typically is pushing air into the HS.
It's not that hard to flip fans, why not try it and see how yours responds to the change.
Just monitor the temp closely.
 

SpaceRangerJoe

Member
Joined
Dec 13, 2001
Location
Tulsa, OK
not many heatsinks are designed to have the air "sucked" across them. the alpha pal 8045 is supposed to suck, but i seem to get better results with the fan pointing towards the cpu. also, i like the secondary cooling effect of the air blowing across the mobo. my brother has an slk800 with a tornado, and he has a ton of air the blows right across the north bridge heatsink, so that helps alot with high fsb setups as well.

your best bet is probably to have the fan blowing down, but test it if you want to. maybe it will work better.
 

DaWiper

Image Compare Man
Joined
Nov 15, 2003
Location
Norway
In theory should pushing the air work better than sucking the air. Cuz when the fan sucks it sucks the air close to the mobo and the "hot" components. That would draw warm air over the fins of the hsf. 1 degr increase???
However when the fan sucks, the deadspot problem would be smaller... Hmmm. Not sure what I think anymore. Try it! If it works you will be happy. If it not you have at least learnt something new...
 

rogerdugans

Linux challenged Senior, not that it stops me...
Joined
Dec 28, 2001
Location
Corner of No and Where
Blowing air into the heatsink is usually (but NOT always!) best.

Almost all heatsinks are designed for air to flow in this pattern although there have been exceptions in the past, and may be a few available now (I am out of touch with the newest aircooling stuff.)

Experimentation is good though- occasionally you may find a system where pulling air out of the sink will work better, regardless of what the manufacturer intended! Air flow is weird and can cause some strange things to happen- try it and see.
 

ZGOZZ

Member
Joined
Dec 4, 2003
Location
NJ USA
This is a good question. You would think pull the heat away would be beneficial for removing heat. But this is not the case.
:sn:
 

rogerdugans

Linux challenged Senior, not that it stops me...
Joined
Dec 28, 2001
Location
Corner of No and Where
Reading this again I though of another point to add:

Checking temps at full cpu load is the best way to be sure which way works best.
Getting a better temp when the cpu is idle is not very relevant; getting 1 or 2 c lower at full load is (at least when overclocking to the extreme end!)