guys plz help me my gpu temp is so high

after install 17.10.1  i playing pubg and after  playying 1 map i check wattman settings ... my gpu temp is 76' ... this is so high how can set is cool (sorry for bad english)

 

 

Gpu : rx470 4gb strix 

cpu :core i54690
win 10
ram 8gb 1600mhz