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The AA settings only work in some DX9/10/11 applications.
The best method to get AA working is to use in game AA via the video menu of a particular game, then set Anti Aliasing Mode to Enhance application settings. Now navigate to Anti Aliasing method and set this to Supersampling. Check if doing this enables improved AA in your game. If it does, then you can experiment using other settings following this method. For example, try in game AA at x2 if performance is bad using Enhance and Supersampling at x4 in game AA. The Enhance method should work with some DX11 games, but not all.
For DX9/10 games you can try using the override option, but it may not work with everything.
For DX12 and Vulkan, these options are solely in the hands of the developer so nothing will work.
Oh I see. Thank you very much. I will have to experiment with this then.l Warhammer is running in DX12 so that's that. The rest - I will have to check out. Thanks for clarifying this!