Ansiotropic filtering is useless in AHII. That comes from Skuzzy. It causes nothing but problems, particularly in the text box and icon fonts.
You must not have V-Sync on or you wouldn't get those frame rates. There have been reports of rubber bullets if you shoot without V-Sync on.
What it comes down to is frame rates faster than your monitor's refresh rate are meaningless.
My monitor's refresh rate is 85HZ, but I run AHII with the 60 fps max box checked. Personally I can't see any difference once the frame rate gets over 35.
From all the posts I've seen, including several from Skuzzy, it is highly reccommended you have V-Sync ON.