New
#81
Intake
Exhuast
I thought I was gone...
What that proved was that his/her system cooled. To be puddin', it has got to be that way for any and every system applied. Right?
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.
Our debate diverged into two separate debates. I just proved myself correct in stating that case exhausts are better for overall circulation in a case than a combination of exhaust and intake (unless the intake is in the front), as previously suggested by someone else. At least we can all agree that it depends which part of the computer we're talking about.