When running Batman: Arkham City at the settings suggested in the window, I noticed that my computer (FRAPS on) did not yield the same results. I got 40-50 fps with vysnc off when flying roof to roof and running around the city. That can't be right for a card that supposidly dominates this game.
I got an i5 2500k overclocked to 4.5 ghz and 8 GB of RAM, running at 1980x1050 resolution 1080p.
Other benchmarks note how the 680 with vsync off perform at 70-95 fps at my resolution. Something is wrong here, right?
It's the game, run it in DX9 mode and it will be fine, the benchmark results you are refering to are likely from the games ingame benchmark, which gives you an average, run it yourself, you'll likely see dips in fps to the 10s, but highs of over 100 fps.
The game engine itself is a heap of crap, I did a lot of research on this when I got my 7970, thought the card was broken