Quote: Originally Posted by Product FRED
That's what I'm saying. It's used for transfer, not storage. Otherwise, obviously the CPU would eventually melt. Again, I'm not talking about power. I'm talking about efficiency and the quickest way to get the hot air out and cool air in. Sucking prevent it from going back near the CPU, which is the point. Blowing pushes it back. Yes, both methods will cool a CPU one way or another, but an exhaust system is much more efficient.
This is where I think you're missing the point... Suction is a very localized phenomenon, producing rapid air movement probably no more than a few millimeters behind the fan... The cold air rusing in along the tips of the fins to fill this small depression behind the fan actually traps
a bubble of hot air inside the heatsink and effectively prevents it from getting to the fan.
Turn the fan around and, yes you're forcing a bit of hot air from the tops of the fins back into the bottom of the heat sink, but you are also forcing a whole lot more relatively cool air right down into the bottom of the heatsink, where most of the heat is. This in turn results in less heat being conducted to the tips of the fins, resulting in even cooler air going into the base of the heatsink.
You see the air in the case is relatively cool, compared to the temperatures of the heatsink. The goal is to push as much of that cool air through the heatsink as you can... and that ain't going to happen on the intake side of a fan. In fact you would simply end up blowing the cool air away
from the heatsink.