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 Post subject: Reverse airflow on HS fan
PostPosted: Mon Feb 10, 2003 1:41 pm 
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Joined: Fri Dec 27, 2002 1:49 pm
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Location: Somerset, WI - USA
I'm thinking of doing something similar to Rusty's Quiet In-Desk PC. I plan on having my motherboard horizontal like he has. I was just wondering what the pros and cons are to mounting a fan so that it blows the air away from the HS instead of onto it. My thought is that since you don't see this configuration often, that it probably isn't as efficient. I would be ducting the air out of the back similar to Rusty's again. My difference is that I plan on having the fan directly on top of the HS still.

Thanks


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PostPosted: Mon Feb 10, 2003 1:48 pm 
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Joined: Sun Aug 11, 2002 3:26 pm
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Location: Worcester, UK
You're right, you dont see it much - pretty much its only Alpha HSs which perform better with the fan sucking air off it, (because of the shroud they use?). Also if you experiment you will see that turbulence noise is much greater when there is an obstacle on the input side of the fan.

Just try it both ways and see which has the best temp/noise compromise.

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PostPosted: Mon Feb 10, 2003 2:37 pm 
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Joined: Sat Jan 04, 2003 3:45 am
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Location: New York, NY
I have an SK-7 and a PC PnC silencer on a 1700+

With the sensor touching the back of the die:
Sucking (air blowing "up" on a horizontal setup) is 2-3 C cooler, but noticeably loud, especially when the fan is at full power (12v).

Blowing (down) is 2-3 C hotter than sucking (note: that sounded very wrong), but the fan makes no percievable noise at medium power (9v).

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PostPosted: Sat Feb 22, 2003 3:03 pm 
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Joined: Fri Feb 14, 2003 11:13 pm
Posts: 41
Location: Los Angeles
BillyBuerger, my new Dell 3.06 ghz and old 1.7ghz both have a similair kind of fan shroud. I have not done any temp tests so all that I can tell you is that the air than blows out of the case fan (attached to the shroud) is much warmer compared to the power supply fan which is cool. It seems to work nicely, but as ChiefWeasel noted the turbulence noise is greater than without the shroud.


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