you need a 32 bits sabayon!
however, if your video board is an old ATI, series 4, or prior, you need the free driver, the package is xf86-video-ati, since proprietary drivers only working with series 5 ATI or newer..
also, remember that new GNOME, GNOME3, GNOME-Shell, not works good with old video boards.
foy your system, the best sabayon versions are KDE, MATE ou XFCE, and all 32 Bits. GNOME may not work!
. download soon, since 32 bits support in sabayon will be deprecated in few months.
ALBERTO FEDERMAN NETO
Favorite Distros: Sabayon, Gentoo, Mageia and OpenSUSE