EDIT: mining ZEC with flypool ~486 sol/s very stable.
Temps ranging from 66-76C depending on ambient temperature and time of day
using MSI afterburner following settings
power limit +2%
Temp limit 84C
Core Clock +220
Memory clock +821
Fan speed
100% (yes its a jet engine)
case side lid off with added mod circular 200mm fan blowing directly onto back of gfx card at 45 degree angle.
BTW I live in the tropics where the average temperature year round is about 76F.