The default that i said is the Free Driver, xf86-video-ati. Try it.
the default ati-drivers of Sabayon, in the repos, are the proprietary drivers, but i have in mind that they not works in the series 4xxx boards.
The live CD apears not contain any xorg.conf. It can be generated by the command:
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sudo aticonfig --initial
Both kind of drivers works in mine ATI, but it is an Radeon ATI 5420. Proprietary drivers are better in glxgears and GPU, bu the free drivers are better in Compiz and more easy to use.