OK I have looked into it and (as some of you have noticed) it actually is:
0x 1x 2x 4x 8x 16x (max 16x)
Where 0x and 1x mean NO antialiasing. That must be a bug which relates to querying the video card's AA settings, where 0x and 1x are listed as valid options.
About the AF filter, the reason why you're not seeing any performance changes is that the texture filtering is not the bottleneck, so therefore no performance can be gained/lost from changing it.
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