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Subject: It wasn't that simple
Name:
 ludicrous
Date: 5/22/2001 11:07:02 AM (GMT-7)
IP Address: 138.67.58.165
In Reply to: thanks..... posted by
Mike
Message:
That discussion went 16 ways from Sunday, and there were multiple conclusions, very few of them in agreement 
Blowing causes the hot air to fan out from the heatsink base around the chipset, memory, CPU voltage regulators, etc. This causes a heat buildup that, in theory anyway, may reduce overall system stability and negate any positive effects of the additional turbulence.
If you mount the fan for "suck" in tandem with placing a "skirt" around the upper half of the heatsink (tape and tagboard can be used to make the skirt, or thin sheet metal if you have the tools), the airflow starts around the hot base and moves upward. The flow may be more laminar, but the heat removal starts around the base and moves upward, more naturally complementing (again, in theory) the natural tendency of the heatsink to "wick" heat away from base and up the fins. This also causes mild cool air circulation around the chipset, memory, CPU voltage regulators, etc., which may have positive effects on overall system stability.
Additionally, with the "suck" method, you can then mount another blowhole fan in the side of the case across from the CPU, and immediately remove the newly heated air. This can have a noticeable effect on reducing case temperature, which promotes lower CPU temperatures because you have a greater differential between the case air and the CPU heatsink.
In other words....good luck finding ANY cut-and-dried answer, there are too many variables  Run it both ways and see which one gives you the best results. But for "suck", you do need that skirt on the heatsink.
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