I have "P5B" motherboard, nvidia 9600 GT videocard, 4 Gbs RAM, FreeBSD 7.0 and the same problem with Xorg!!! I read this topic and tried to decrease my RAM to 2 GBs. And successfully started Xorg!
So what is the problem? Is it motherboard, nvidia driver or FreeBSD bug? Or all together? And what can we do with this?