Hello,
There.

Well well, I can't find any good information about TXAA or MSAA x8 in Brasilian Websites.
So I found information in NVIDIA Website.

But in true.

TXAA x4 it's better then MSAA x8 with performance of MSAA X4?

I meaning, it's really true, because My brain don't let me believe. I do play MSAA x8 and TXAA x4 and I can't believe TXAA x4 are better. I don't know.
Maybe my brain can't accept the fps I got.

MSAA X8 30 FPS / 40 FPS ( all Very Higher )
TXAA X4 40FPS / 55FPS ( all Very Higher )

Multiplayer of course.

So, What the comunity can tell me about?
I really need to believe that.

I'm about to buy GTX TITAN because I can't acept playing with less then 55 FPS.

dont buy a titan.....your 680 is plenty enough. If you are desperate for higher fps then 680 SLI is cheaper and yeilds more performance, hell even 670 SLI is equal to Single Titan.

i find smaa medium is the best bang for buck (quality per fps)

in multiplayer i turn it all off in favour of higher framerates and less input lag. in my opinion, in multiplayer, you shouldnt be worrying about the looks of the game because you should be worrying more about seeing those pesky stealthers, and avoiding as many framerate dips as possible.