Our Halo benchmark consists of many cut scenes that are somewhat graphics intensive. Neither Anti-Aliasing nor Anisotropic Filtering will have any affect on the way Halo looks because many of the effects in Halo rely on using render targets and post processing. The scenes in Halo are rendered to an intermediate buffer instead of the video card's back buffer, and then the filter effect is applied before the final frame is copied to the video card's back buffer and projected on your monitor. Therefore, we did not run any tests in Halo with Anti-Aliasing or Anisotropic filtering on. All it would do is lower our frame rates dramatically and without having any better image quality.
There's really only a marginal 5-7 FPS difference between the two cards in the Halo benchmark, clearly nothing to jump up and down about.