charlie is saying something quite interesting.

usually people think of ATI cards as being great in some and really bad in others, while nvidia are just good in all.
but he believes the tables are turned and that the card will basically suck in any game they didnt have their devs help code

however i wonder if the games that do run great will also generate a lot of heat and push the cards to their limit (like running furmark on a 4800/5800 and hurting them). too much efficiency can push a gpu out of its thermal specs.