Well FXAA is a post-process anti-aliasing technique. It is far from something I would call good, but in recent years good implementations have avoided extensive blurring making it good enough in some cases. In the regular nvidia control panel there is an option to turn it on.
http://puu.sh/mTpAI/99b47b9b5b.png. If the AA settings in this thread cause too many performance issues, that's what I'd recommend. Make sure you turn off in-game AA.
Make sure you turn off the AA stuff you tried with inspector too. You should still be forcing 16xAnisotropic Filtering though.
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