Here are AMD's recommendations on system building. I think Page 9 with the power consumption is interesting. I think their AGP slot power requirement is a little low.
<A HREF="http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/26003.pdf" target="_new">http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/26003.pdf</A>
<A HREF="http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/26003.pdf" target="_new">http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/26003.pdf</A>