The previous comment contained a link to the wrong driver version. NVidia recently released a new legacy 304xx version, which should be compatible with xserver 1.16. https://devtalk.nvidia.com/default/topic/760649/unix-graphics-announcements-and-news/linux-solaris-and-freebsd-driver-304-123-legacy-for-geforce-6-and-7-series-/ -- Alex