Originally Posted by jetguat
But with positive pressure wouldnt more Air be looking to escape the case. Wouldn't that work to the advantage with an acx cooler? And unless the positive pressure was much higher might air coming into reference cooler cause it to work harder?
As far as I know, with positive pressure the air is going to build up inside the case and "stay there" a little longer than with negative pressure which acts as a vacuum, pulling in air from anywhere possible because its being expelled quicker through exhausts. If you have an ACX cooler which is blowing all the hot air into the case rather than expelling it like a reference design cooler would do, the temp inside a positive pressure case is going to be higher than if it was a negative pressure which would be expelling the air quicker than it is entering the case.This article
explains what I mean quite well along with its diagrams - scroll down to Air flow: positive or negative pressure
about a quarter way down the page.
Someone please correct me if I am wrong, but this is just my understanding.
[EDIT] To answer your third question, having negative pressure with a reference cooler would cause air to be pulled through the reference cooler's exhaust effectively pulling the warm air back over the GPU's heatsink and into the case, as well as causing the fan to work harder. I cannot for the life of me find the animated .gif that showed this but it was perfect for giving a visual description of how it works. I did however find this animation
- notice the white arrows (tiny stream) coming in from the PCI slots; this would happen even with a reference (exhaust) cooler on the GPU.Edited by Legion1183 - 8/14/13 at 2:45am