well Zotac GPU temp are normal at that level i guess there is nothing we can do i myself using Zotac GTC 760 Blowerfan GPU and it hit @80'C in Seconds of gaming and in few games sometimes reach at 90 too... i have verygood airflow in my CM690III Case bus still i cant control the temp of GPU however i have changed the thermal paste of GPU which helps to reduce the temo little bit