I am running the minimum video specs: GeForce 2 MX400 64MB, w/T&L and using latest Nvidia drivers 81.85.
Other than the opening game credits and intro, game has been running great! Though, I have read people having this same problem with 6800GT cards. So, that may be a software bug, or possibly an Nvidia driver bug (a heard that older Nvidia drivers were fixing up some probs, but haven't tried anything)
Logged in about 3 hours last night, with no probs with gameplay.
Point I'm getting at - don't rush out to plop down $200-$300 on a new video card just yet. Give it some time for a patch, or for these boards to populate with fixes.
Good luck!