Quote Originally Posted by Stabface
Are you running the multiple instances of WoW from separate directories?

Actually that looks almost like a z-buffer problem... what is your depth buffer setting?
When I three box I run one copy from a full install of WoW and the other two from a mostly simlinked copy of wow.

I actually got an RMA from MSI today, it appears this is a known issue with the 7900gt's and I'll be getting a new card sometime next week.