7770 vapor-x sapphire overclocking questions

[killzon32]

I am wondering what the temps should be and when temps become out of hand and should stay away from.
It generally stays at about 66c when in a benchmark I am worried its to hot.
Anyone know the maxtemp and how much is to much and any experience that would be great thanks

 

[unksol]

66 is not hot especially for overclocking. GPUs are rated up to 90+.