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Originally Posted by zeropointbug
Well, to be honest, MOST heatsinks for CPU nowadays are just designs, that's all they are. Lot's just looking cool, decent cooling capabilities, nothing great. Most heatsink design is coming from PC industry now.
Like i said, heatsink design is tricky, as there are several ways you can make it perform: such as LOT'S of airflow, NOISY, and guaranteed to work, with moderate fin count. OR another extreme, like these large tower heatsinks, using heatpies densely around the CPU, then efficiently transferring the heat as vapor to a large set of fins. This method works amazingly well, and better uses a given surface area of fins, than a simple heatspreader, fins design.
What kind of experiment did you do?
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Problems can be found here under "Limitations" and at the bottom check "See also" and "External Links"
heat-pipe selection guide
As far experiment - you know the answer, right :)