Yeah, I'll be quite surprised if the x1300 class can do hdr + aa at playable speed. If it can, then that bodes well for x16/1800.
Also, for what it's worth, pcpop has what looks like a preview up:
http://www.pcpop.com/doc/0/111/111034.shtml
No benchmarks afaict, but a bunch of pretty pics of the board and
two screenshots from AoE3. For some reason, they also put up comparison screenshots from 6600gt. I can't read the language but guess it was meant to show x1300 running sm 3.0 code.
I just had a thought: are those AoE3 pics running hdr + aa?