Yes its completely normal. In Canals, albeit a small map, I get 60 FPS maxed out at 1440p with dual 7850's. I think its SMAA injector helping out the AA though, so those results might be a little warped.
Mine never go above 70.
You know what is odd though? I run crysis 2 at 1080p @ 62 fps no hiccups, but both of my gpu's are only between the 50 60 or 70 percentile range of usage. Is there anyway to get them to 99%?
Yeah I have the same issues, I basically get the same amount of frames in CFX than I do having a single GPU. I live in Australia, and we have like 40 degree heat atm, so basically my GPU's are never lower than 50 degrees in idle.