I think 1GB of ram is quite a lot for this game. Almost everything except the map is only textures and models. (and the SFX is heavily compressed).
I tryed HDR and SSAO and it makes no viable difference in speed, but the visable quality diffrens is quite high. I dropt the AA down to 2x, it made a little diffrens but not a lot. Really only gemoetric resolution that made any notasible diffrance in speed.
Also, i have 3GB of GPU memory, so it shold be no problem
