All I know is that it should be a Radeon HD 3300 or 3200 (difference is 200 Mhz freq. afair) with (afair) 64MB sideport mem built in by Asus. The fglrx should hopefully support that chip already, for the free drivers one had to find out on which chip design it is based upon and then go for the x-wiki and look what already works in xf86-video-ati (radeon) and the radeonHD.
I'm also looking at these boards a.t.m. cause I'm to get an AM2+ one for me. And I still compare several ASUS und Gigabyte models.
Stop TCPA, stupid software patents and corrupt politicians!