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For passive cooling, is flow rate important?

post #1 of 8
Thread Starter 
For active cooling, higher flow rate means better performance.
How about passive cooling (without fans)?
post #2 of 8
same thing
air over fins = cooler
otherwise the air just stagnates.

I was running my old i7 @ 3.8ghz passively. As in no fans on the CPU heatsink itself, just case fans.

works fine as long as your intake and exhaust is balanced well.

Then I built a shroud to direct air from the front fan to the CPU heatsink. I got the same cooling benefits of a direct fan, without the turbulent noise of fan blades passing so close to a surface.


This is OCN though. Home of $40 push-pull shroud setups on heatsinks for every little degree of difference... so i doubt many will back me at all in my former actions.
post #3 of 8
Why bother with passive cooling though? You already have a pump humming. You can use some low-speed fans (500-800RPM). They should be inaudible while massively improving cooling capacity.
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post #4 of 8
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
Why bother with passive cooling though? You already have a pump humming. You can use some low-speed fans (500-800RPM). They should be inaudible while massively improving cooling capacity.
I have no money to buy fans. I'm poor.
http://www.overclock.net/water-cooli...-guy-made.html
post #5 of 8
I have found that just switching one fan to give just a bit of positive pressure in the case actually helps...i.e more air blowing in than is being pulled out... you don't want much but i found on an older athlonx2 4400+ that a slight amount of Pos pressure decreased my temps 5-8 degrees..
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post #6 of 8
Quote:
Originally Posted by pionee View Post
I have no money to buy fans. I'm poor.
http://www.overclock.net/water-cooli...-guy-made.html
LMAO i just looked at this a few minutes ago... that is awesome... it must not work too great if you are trying to bring temps down yet?
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post #7 of 8
You don't have to use computer fans, but just any air flow will increase performance so much...

What about getting a 12V motor from somewhere and making your own? or pull one out a car? Or cannibalising an old computer... Loads of people throw old PCs out at the dump...
    
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post #8 of 8
This ^

Check your local recycling center/dump. A friend of mine once found a MacBook Pro and the only thing wrong with it was a cracked screen.
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