Short version, anti-aliasing smoothes lines at an angle so they don't look jagged and prevents some weird interlace effects that can appear on distant objects while anisotropic filtering compensates for the elogation of pixels on a texture surface. BTW, a friend of mine has a ti4200 and I have a 9800pro. So far I've borrowed WCIII, Jedi Academy, NWN, and soon will be borrowing MP2 from him. I've seen him play all of theses and they look great on his comp and I can't remember him turning stuff off. IMO, there is little to no diffrence on my comp with my card on the first three I mentioned. (except for better AA on mine) There was an odd dynamic lighting bug on the ati cards though for jedi academy. Taking a minute to look at the lucas arts site, ok this took longer than a minute, but I see that they still have this listed in their FAQ so I guess its not patched yet.