HOWTO Notes on open source and closed source states of AMD 64 drivers
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Normally all open source drivers should work if they do not contain specific x86-32 code
- there are some closed source ati drivers for amd-64
https://support.ati.com/ics/support/default.asp?deptID=894&task=knowledge&folderID=27
- there are some closed source nvidia drivers for amd-64
http://www.nvidia.com/content/drivers/drivers.asp
Note: To install the nVidia-provided graphics-driver-package (called "nvidia" in xorg/XF86.conf, not the generic "nv"),
do "emerge nvidia-drivers" or "emerge nvidia-legacy-drivers".
You have to recompile ("emerge nvidia-drivers" or "emerge nvidia-legacy-drivers") the kernel-module after every recompile of your kernel.