From my experience, World In Conflict has usually run much better on Nvidia cards. It is possibly a driver issue, however, as back in beta, ATI cards fared much better.
Irregardless, the Asus EN8800 GTS has a healthy lead over the Powercolor HD 2900 Pro in this game, at regular clock speeds.
Also please note: the Asus EAX X1950 Pro scores here are so high because this card (and ONLY this card) ran the benchmark in DX9 mode, because it is not capable of DX10. We included the numbers because we thought it would be a good point of reference -- not to mention, the game really doesn't look much different in DX10 mode, compared to DX9.