High Quality AA and AF
Our high quality tests let us separate the men from the boys and the ladies from the girls. If the cards weren't struggling before they will start to now.
Cranking up the AA, the HD 6800 series begin to struggle and we see it fall down to unplayable numbers in most situations. Far Cry 2 is border line and if you push to only 4x AA you could probably get the FPS. Of course, SFIV isn't an issue even at the ultra-high resolution.