I have an HD 7970 Blower style gpu which heats up to 90C in some games,if i play minecraft it will not heat up above 80C but if i play something else like Steel Oceans or Space engineers at ultra it will heat above 91C (and no framedrops occur), my gpu's heatsink is cleaned and it has thermal paste applied (arctic silver 5) my case has 1 fan and im waiting for the other 4.