Has this ever happened to you?

Hey there. This might sound a bit strange, but when I fly with 8xAntialiasing and 16xAnisotropic filtering, I get more frames than I do with neither of the above turned on!
Has anyone else experienced this? Also, to me, there seems to be no difference in picture quality when they are both on and off. Any advice?
Thanks,
Rob
Has anyone else experienced this? Also, to me, there seems to be no difference in picture quality when they are both on and off. Any advice?
Thanks,
Rob