Re: problems with 1.0-8762, GF6200 and GF6800GT
6200: Did you compile the nvidia-driver port with support for FreeBSD AGP? Also, is that LoadKernelModule option needed for your system?
6800GT: Check what xorg.log has in it for EDID. The nvidia driver may be picking its own refresh and sync values. I used to have the IgnoreEDID option in my xorg.conf, but it is now ignored. Search the README file for UseEdidFreqs to see if that helps.