If you are talking about the upper card in this configuration (2x 6970) then these temperatures are fine. I currently have 2x 6950's in a drawer (yes, a drawer) with 4 fans venting. I have an OC to 900MHz on the core and 650MHz on the mem. with 1.14V. I get roughly 82-85C on the upper card and 72-75C on the lower card. You could try a switch between the cards, some run a bit cooler, and a bit cooler might mean 5-10C if you switch them.