ATi Radeon 4000 Series Anti-Aliasing Investigation
Conclusion
Some interesting findings have been made in this investigation. Firstly, the difference between 8xAA and 12xAA isn’t as clear-cut as simply assuming 12x is better (and therefore slower) than 8x. In some cases, 8xAA provides better image quality than 12xAA. Also sometimes 12xAA is faster than 8xAA; significantly so on occasion. If you find you have spare performance at 4xAA but 8xAA is too slow, try 12xAA as it might actually run better.
The second interesting finding is that edge detect CFAA seems to impact the image quality of AAA in situations where the base multi-sampling mode is the same. This suggests that edge detect CFAA is capable of sampling outside the pixel’s boundary on alpha textures when AAA is engaged.
And finally, while 4xAA definitely remains the sweet-spot for AA, don’t ignore the higher modes if you have enough performance, as they can provide a visible benefit over 4xAA.
Hopefully this article will encourage everyone to experiment a bit more with their ATi cards when gaming. Stay tuned for the nVidia equivalent of this article sometime in the future.
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