These benchmarks look fishy. Last time I tried openarena anholt demo my fps was much higher on HD 5750.
Are you running with swapbufferswait on again? It's likely to have a negative effect on fps. You can argue all you want about defaults being used, but with this setting on it's unlikely you'll see much performance progress being made in some benchmarks, making the benchmarks kind of pointless.
Insanity: doing the same thing over and over again and expecting different results -- Albert Einstein