Well, honestly, if you're running at a good resolution, you don't need 4xAA (2x usually takes care of notable aliasing at 1024 or higher) or 16xAF, as they were designed to improve visual quality on low resolutions, and at high resolutions just rape your framerate without a good quality tradeoff. Dunno why you'd be having trouble with it though, the 6600GT is a fine card and your system seems pretty good overall... I've run the game with the new textures at 1280x960 with 8xS AA and 16xAF for testing purposes and it runs at fullspeed all the time (much higher if I turn off the frame limit), and my system isn't super special. I acknowledge the pack boosts requirements, but your estimated requirements seem to be more than a bit high since the game itself can be run fullspeed on an Athlon 900mhz system with 512mb of RAM and a Radeon 9200 at 1024x768 with 2xAA and 4xAF... Also, excellent pack Djipi.