AF
because of the way a gfx card renders stuff, the further away a texture is, the more blurred it is, AF eliminates this to a degree, on a 9700 the performance drop isnt much on any setting.
FSAA
eliminates the jagged edges from surfaces in a game. Depending on the resolution, level of FSAA, and complexity of game world, the performance drop varies.
TruForm
A rendering technique that turns low poly game models into higher poly ones. This is ment for older games, and doesnt perform very well with a 9700pro, as for proper use, it needs 2 tmu`s per pipeline, which the 9700pro does not have.
These are a very simple explinations of the three. Search in google for more detailed information on them.