Further to Ratsass post..
Seeing as your vidcard has fans on the top, if you don't already have one, look for a really good fan for the side panel which would blow cooler air right at the card. If no side panel opening then put a fan in all other available slots and as suggested get the cables out of the way of airflow.
If that's not enough then you'd benefit (as most of us do) with an automated fancontrol program like MSI Afterburner which adjusts fanspeed vs. gpu temp. It will take some experimenting with the graph to balance noise with the 80c max temp you'd like.
#1: Phenom II C2 955BE @ 3.6, Antec Kuhler 920, Gigabyte GA-MA790FX-DS5, Asus 5870/V2, ASUS Xonar D2X, 4 x 1gig OCZ2N1066SR2GK @800, Antec Truepower New 750, Arc Midi, Vistax64
#2: Athlon 64 X2 4200+, AGP 1950pro, Audigy 2, Asus A8V-D, 2gig ram, Enermax 465P, Antec900case. Now on Win8.1pro cat 10.2