The Real World
Below you'll see several screenshots, both from the Radeon X1900 and GeForce 7. There are three screenshots from the Radeon X1900: 4x AA with 16x AF, 6xAA with 16x AF and 6xAA with with 16x HQ anisotropic filtering. From the GeForce 7, we have 4x AA with 16x AF and 8xS AA with 16x AF, in that order. Let's take a look at them.Call of Duty
Radeon X1900
GeForce 7
There's very little difference between the Radeon X1900's screenshots. The most noticeable difference is on the fence on the left, between HQ AF and the standard AF shots. However, even 6xAA with 16x HQ AF can not come close to NVIDIA's 8xS. The use of 2 sample supersampling in this mode provide the best image quality for that area. You probably won't notice that in gameplay though. Other than that, we don't really see any improvement over 4x. The reason maybe caused by the lack of faraway objects on the horizon.
Nascar 2003
Radeon X1900
GeForce 7
The most obvious difference between these shots are the slightly sharper, darker texture of the crowd between HQ AF and all other shots. The 8xS do come close, but HQ AF is the definite winner here. If you look down the track, you'll see that the 6x AA 16 HQ AF shot has 'leaner' poles than all the other shots as well. In all fairness, these differences don't amount to much, but they do show that using more samples when anti aliasing will help display faraway objects with slightly less aliasing.
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