It depends on the room temperature where it is mining at first,second at the fan speed you are running,I for example keep mine at 80% fan speed from more than 1 year mining with such card and usually the temperature max I have seen is like 51 degree Celsius,now in the photo you see here it is at 45 degree Celsius with 80% fan speed,I prefer the lowest possible temperature for my cards in an attempt to prolong their lifespan,this has a risk of ruining fans but fans can always be changed.
Gpu and mem temperatures look pretty good. Fan speeds can still be increased. Cooling the cards that cools the ram ultimately increases revenue. Like you said, fans can always change. It can also be run 100% when needed. I'm using the Hive OS and the fan speeds are currently around 70%. The temperature of the area I am in is sufficient. As the summer months come, these speeds will increase. Defective fan can be replaced.