yikes. I use EVGA precision as well on a GTX 285 and I don't get near that. My GPU useage and temps don't increase till the games launching. Launcher is minimal. But even with the game going I set my fan at 55-60% and that puts me at 70 degrees and about 70% GPU useage.
Really looks like your tower needs better airflow or there's something wrong with your cooling fan on the card.