Hi, 
I have the PC version, also I have GTX580 video card and Logitech G15 keyboard with LCD so i can monitor my stats real time, for example VRAM. 
  
When i change texture size from low to Highest available, the game textures do not change, they look the same. 
Also the used VRAM stay exactly the same. 
  
I tested both by changing in game and by changing and then reloading the game (full exit and then load) 
  
Second bug: I dont see any Difference in AA quality from 0 to X8, I do see increase in VRAM usage but aliased objects like stair and windows and tables have same aliasing with AA=OFF and AA=x8 
  
reinstalled the game twice 
  
Thanks