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.
AMDs lack of AA performance means that the 8600GT which tends to be slower in other tests is able to come out ahead here.
Half Life 2 (Episode One HDR)
We again see the 8600GT come out ahead, and even the 8500GT is not as far behind as usual. It just goes to show how much of a performance hit AMD users take when turning on AA.
We again see the 8600GT come out ahead, but with an average of 40 FPS you're not actually going to be able to game at these settings.