everything on 2048 regardingless of how dssopt optimizes textures. saw that a nebula texture got reduced to 1x1 pixel  and many others increased in size; but i didn't care.i started a new game and without using a GVRAM observator i think CTDs were really caused by overload of VRAM. mods like skyrim map HD are the only one i can potenciallly see the difference igm.. the funny thing is that i never had any problems with stuttering or low FPS - i had just the typical ctds.. System: GPU Gforce 670 2gb Vram (slightly overclocked) intel ? @3,9 ghz (4 core), skyrim runnng on SSD, 16 GB RAM