QUOTE(cdlim87 @ Feb 9 2009, 09:29 PM)
p/s: my picture is js a simple quick draw for a reference, its not follow to the real object size ratio.
a picture means a thousand words

though it is simple...it really explained alot regarding the airflow....

well zenetics..just an advice from my personal experience...it is also important to put an exhaust fan beside the GC...especially the area where the hot air spills out from the GC's HSF ....buy doing so...you actually reduce alot of heat around the GC area (as we all know..that is one of the hottest component in most new PCs)
maybe with this addtion..you can get better results with the first setting as per in cdlim's post (by exhausting the air through the top) coz the hot air had been drained out
however i think the second option is still the best as you can see...your HSF is sucking in fresh cool air from the front intake fan and properly disposes them through the rear
the best method of airflow is to get as many hot air out and at the same time a decent amount of cool air in....having all fans blowing into the casing makes it worse ( i dunno why..but i see most of my friends do it like this)