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 Post subject: WTX specs have good cooling info
PostPosted: Tue Jan 07, 2003 12:13 am 
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While I was doing research for another posting, I came across this website: http://www.wtx.org. There they have the wtx specs in pdf format.

I only browsed through it, but I noticed some valuable information about the amount of cooling needed for any given power draw. They talk about the volume of air passing through the case for x number of watts. If you go to page 32 in the PDF you see what they recommend. Just a quick summary of the exhaust cfm's:
  • 400W: 90CFM
  • 200W: 45CFM

It seems like there's a linear relation between power and cfm. So if one computer were consuming say, 100W then you'd need about 23cfm of exhaust fans to adequately cool the system (give or take considering wtx is designed much differently than atx).

While not very useful for people who already know what a given calibre of system needs for cooling, it could serve as a starting point in those situations where the system is not well understood by us silentpc folk yet (think hammer, merced, mckinley, prescott, alpha, <insert your fav cpu here>)

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PostPosted: Tue Jan 07, 2003 12:26 am 
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Good find, pg! That's a useful piece of info, generic though it might be. It certainly gives one a good starting point.


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PostPosted: Tue Jan 07, 2003 1:28 pm 
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You're gonna have one HOT system if you dont use a ducted exaust on the HSF, which would also mean flipping the fan to pull air through the fins, not push the air through them. Since it's already at the bottom, using an intake duct won't make any difference (still injecting hot air into system).


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 Post subject:
PostPosted: Wed Jan 08, 2003 5:28 am 
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Joined: Sun Dec 22, 2002 8:40 pm
Posts: 161
Location: Uruguay
It isn't linear
If you wish to have a good cool-silent pc you have to look at components working temperatures, some may work at higher temps, some may not.
What's best is to take a look at your manuals and see which is the "normal working temperature" and also look at the max temperature.

I know some won't like what I'm about to compare.
Gas engines commonly work at 50-60 degrees
Diesel engines commonly work at 80-90 degrees
This are normal temperatures, both engines work great at those temps.


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 Post subject:
PostPosted: Wed Jan 08, 2003 11:27 am 
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I think the AMD doc is referring to the airflow through the case, not specifically ON the CPU HS.


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 Post subject:
PostPosted: Sat Mar 01, 2003 12:47 pm 
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Location: Falun, Sweden
Quote from the ATX specs:

Image

So, yes, it's linear in the simple case - same delta T.


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