OP, in that link above, to the right of where it says the 12p/5vp there is a little arrow that is labeled "customize". Go ahead and click on it, then click the first icon on the left that pops up. It will bring you to a page where you can install what's called the NVstrap driver. It basically allows you to customize how many pixel/vertex units your card will function with. Installing it takes a second.
Next, head to the customize button. It will bring you to
this page, courtesy of 2Xtreme21. It should show a hardware masked pixel unit and vertex unit. Check them, and ok.
Now you're back in the NVstrap menu. Under Active pixel/vertex units configuration, select "custom (16x1, 6vp)". Then check the box labeled "Allow enabling hardware masked units". Hit ok, and reboot.
Check Rivatuner to make sure you're still saying 16x1p, 6vp after reboot.
If so, run 3dmark03/05, and a couple games. If everything looks fine, you've got your 6800GT. Angst against MSI for the rest of your life.
If everything doesn't look fine, you're stuck with 12 pixel pipes and 5 vertex processors. Angst against MSI for labeling GTO products as GTs.
If Rivatuner says you're at 12x1p, 5vp after reboot...angst some more, then contact either MSI or your vendor.