More recently as of the HD 6000 series, ATI has introduced Morphological Anti-Aliasing (MLAA) which uses post-processing to apply a form of full-scene anti-aliasing to any game, with performance similar to edge-detect CFAA but with better results. Nvidia has also introduced Fast Approximate Anti-aliasing (FXAA), which is similar to MLAA. In both cases, the main drawback is that they can introduce some blurring to the scene. A recent form of MLAA that does not have blurring, but performs quite well is known as Subpixel Morphological Anti-Aliasing, or SMAA.
SMAA S2x is SMAA 1x + MSAA 2x
SMAA 1x : improved MLAA, better quality, faster speed, slightly slower than FXAA
MSAA is basic, isn't specially optimised or anything, but it gets the...