I run a total of 75 5830 sapphire extremes and NONE of them have ever gone above 74c so yes something is wrong bro. all mine are clocked at 975/300 and they stay about 67c
damn! 75? nice how do you get the mem clock to go lower? my 5830 goes to 500 thats it.
mines hit about 69c OC'd 930clock/500 mem clock