Stock cooling sucks!
I removed top cover from cooler, removed stock vent, mounted 7x7cm vent onto stock heatsink (fixed with hot pattex - melted plastic, this vent has higher rpm and it's also quieter than stock one). Now the temperature is reading:
50 - 52 degree celsius. 10 degree cooler than before!
Now I ordered Zalman VF 700 kit, it should have same cooling capacibility + it contains ram heatsinks (my card doesn't have them now).