that is aload of turd, what you are telling the computer to do is to running level 2 settimngs when you select level 3 i.e. high. you are not actualy improving graphics, just making people believe you are. alod of rubbisgp.
Actually there is a clearly noticeable difference in image quality with the modded cvar files.
Not to say it is actually running DX10, it isn't. It is emulating it though.