In building in normal tower case using normal GPU we need lots of front to back airflow so the heated air coming off of GPU is moved back and out of case and not back into GPU .. or up and into CPU cooler. This is why in earlier post I said to remove all PCIe back covers to increase rear vent area around GPU and thus better front to back airflow around GPU. 2x front and 1x bottom good pressure rated fans are usually all that is needed.
Phanteks Owners Club Ways to Better Cooling
i7 980 @ 3.55GHz =PH-TC14PE w/2x TY-143 fans =Crucial Ballistix 3x4GB =GA-X58A-UD5 =ASUS GTX580 DirectCU II =Enermax Modu84+ =Define R2 w/3x TY-140 case intake fans; all PWM controlled by CPU fan socketPhanteks Enthoo Primo MoBo Rampage III Extreme CPUi7 980X
@ 4.0GHz =R1 Ultimate
w/2x TY-143 fans =Dominator GT 6x2GB
=Rampage III Extreme
=ASUS GTX580 DirectCU II
=Enthoo Primo w/ custom castor base