I finally got both of these Sapphire 6970's going over the past 2 days. Both cards running 940/1450 @ 1.150v and 75% fans (2750rpm). They can peak at 88C for brief periods, but one stays at 79-80C usually and the other that I replaced the TIM on at 75-76C.

Pulling 512kh/s avg per card mining either LTC or DGC with:

-w 256 -v 1 -I 20 -g 1 -s 5 --thread-concurrency 8192 --no-submit-stale