Does anyone know what the in-game anti-aliasing option does? I mean, what type of anti-aliasing is it and how strong is it supposed to be? tbh on a 9800GTX+ 512 enabling the in-game setting has either a non-existent or a very subtle effect on the visuals, and no FPS impact.

I'm not sure if it's some eccentric 'work-around' form of AA like edge-smoothing or if it just isn't working...

I mean, way back in the Oblivion days AA wouldn't work in combination with HDR...I wonder if that's still the case.