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Ok...I guess my Vantec Aeroflow which have been keeping my overclocked AMD2500 under 40C idle is going backward then.
Most HSF that pull air have a shroud around them to stop the case air from rushing in...when you pull air you essentially create a vaccumm. When you push air you give it momentum and are able to direct it onto the CPU.
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Off of
www.firingsquad.com
After you've got your heatsink, the next logical step is to put a fan on it. But which way should it blow? There really isn't a set answer for this question. It all depends on the situations that this fan and heatsink are in. Let's take into account heatsink design; some coolers come with shrouds to go over them. In cases such as these, it is beneficial to have the fan suck the air out of the heatsink, as the shroud causes air from the bottom of the heatsink to be pulled up. Most shrouds have a small opening at the bottom, near the base to allow the influx of cooler air, to replace the heated air that was pulled out. If you are trying to pull air out of a heatsink without a shroud, the results can be mixed. Depending on the design of the heatsink and the airflow patterns that result from it, the only thing you can do is try both ways to see which works better. We're betting that air blowing onto the heatsink will be the better solution in this case. If the fan is going to be pulling air out of the heatsink, the airflow patterns will take the path of least resistance, and as these fans aren't terrible powerful, chances are that the hottest air (the air closest at the very bottom) will not be moved effectively.
so it really doesnt matter unless your HSF uses a shroud. I have had no issues with the air blowing away. but im not O/Cing