Graphics upgrade on the mmi 2g high system?

[Rick]

Is it possible to upgrade the graphics card/chip in the 2g high system for better quality.
I saw a thread on another site that shows this for 3g.
Just curious if its possible as my dads 3g system just looks slicker on the screen, more defined and clearer etc. Or can it be done with a software update? He has 3d maps but i dont.