Fps question... Does this sound about right?

Currently rocking 2 radeon 6970 hd cards in crossfire and in eyefinity 5760 x 1080. For amnesia the dark descent I'm getting around 30-40 fps average... But I was secretly hoping for more performance out of these cards. Also in WoW, I can run it quite smoothly (120+ fps in dungeons, 40-50 in large cities). However, when I try to run it full screen (which it only let's me do in eyefinity running DX9), the framerate drops considerably, and despite the framerate monitor telling me 30 fps, the graphics feel extremely choppy and un smooth. Moreover, I learned that crossfire doesn't work in windowed mode (which is really the only way wow runs smoothly), so running 5760 x 1080 on basically a single gpu at ultra settings brings my card up to 90c and a little higher. Is there a way to fix this? What do you guys think?

Any help would be much appreciated!