Because I though when I got my GTS 450 that some of my WoW GFX oddness would go away .. but they haven't. Through out my WoW playing on this rig with a GF8200 IGP, GF 9600 GT OC & my new GTS 450 OC .. the chipset has always been the same, the GF8200 (MCP78). There are two odd things that happen in WoW:
1. Sky Cloud textures change/fade in and out in very obvious steps.
2. Some of shadowing in the game looks interlaced.