I have a ASUS DC2 7970 and I have it heavily OCed and stable, but I think I could get better temperatures because every time I hit 80C, artifacts tend to happen and after reading this on overclcokers.net I found the OEM thermal paste to be quite crappy.
http://forums.overclockers.com.au/showthread.php?s=4f9314e605342742f860ae746c8faed5&t=1047563&page=2
My OC - http://www.tomshardware.com/answers/id-1837310/locked-unlocked-amd-gpus-limits-mine-asus-dc2-7970.html
http://forums.overclockers.com.au/showthread.php?s=4f9314e605342742f860ae746c8faed5&t=1047563&page=2
My OC - http://www.tomshardware.com/answers/id-1837310/locked-unlocked-amd-gpus-limits-mine-asus-dc2-7970.html