Have you ?
emerge --sync
emerge portage
layman -S
Then search and it should be there for both x86 stable and non stable.
emerge -s nvidia-drivers
ends up as version 100.xx
If all else fails right click and save to desktop this file.
http://www.nvidia.com/object/linux_disp ... -9755.html
NVI*.run
To run / install it = at login window at the bottom is menu and use console login after downloaded and saved to your desktop.
cd /home/elvis/Desktop
then
ls
next
sh ./NVI*.run
follow the questions even if can not download kernel something = yes and continue.
At the end it will ask for nvidia config = yes and then reboot once finished.
It might complain about missing kernel and can not install then have to first
emerge sabayon-sources
and copy the
cp /proc/config.gz /usr/src/linux/config
This usually works.
then
eselect kernel list
eselect kernel set 3
replacing number 3 with the correct one for you if not already set.
then run the installer again
sh ./NVI*.run
Hope this helps.