It seems to me that cooling a high powered card would work best by taking a suction on case internal air and expelling the heated air directly out of the case. Yet the concensus I see is that having 3 fans recirculating the heated air inside the case and using other fans to expell the heated case air is better. Why is this ? Is the blower fan woefully unable to move enough air through the heatsink, Or is the heatsink itself ineffectual at heating the air ? What is it ?