I used to mine with UBUNTU OS / AMD (ATI) graphics
This is what I used http://sourceforge.net/projects/amdovdrvctrl

I don't know what the temp is suppose to be; but if I'm not mistaken, if I overclock my gpu to 100%, it was running around high 70s and low 80s. I mined for a year before quitting and the cards were still working. Sold it to a friend and he's still mining with those stats.