> I think it was one of the first card that they worked with, back in the old days
> before even the SAM.

This must have been the not-so-old days then, given that the 9250 was released only in July 2004 ;-) Some news items from the old days:

http://www.amiga-news.de/en/news/AN-2003-10-00129-EN.html
http://www.amiga-news.de/en/news/AN-2003-10-00131-EN.html
http://www.amiga-news.de/en/news/AN-2004-02-00079-EN.html

So you can see that the first Radeon they worked with was the first Radeon there was, i.e. the 7000. This is also what's used on the Micro-A1. What followed were the 7200 and the 7500 and then the 9000/M9 (as used on the Sam440ep) and the 9200.
And before Radeon, they worked with Voodoo and Permedia 2 cards btw.