If the video memory gets overloaded that will cause stutters for sure. You are unlikely to see the stuttering go away until the game textures are reduced in size or compressed so that the video memory in use is below 1Gb for the high end players and 500Mb for the mass market. Turning off all AA and AF will certainly help keep video memory use down but the main problem is almost certainly high resolution textures.
It would be interesting to see some results from Rivatuner of video memory in use at various settings.
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