GF6200: Yes it is with support for FreeBSD AGP and the driver is loaded from loader.conf (and agp.ko as dependancie)
GF6800GT:
Xorg.0.log

WW) NVIDIA(0): Unable to get display device CRT-1's EDID; cannot compute DPI
Xorg.0.log

WW) NVIDIA(0): from EDID.
Xorg.0.log-(==) NVIDIA(0): DPI set to (75, 75); computed from built-in default
I wander how does this worked with old driver ... monitor is DELL Trinitron P1130 (21").