While not an AMD user, I saw this post on agn3d.com that I think may help out some of the peeps on this board.
http://www.agnhardware.com/html/agnhw-news.cfm?date=05/09/2000&NewsID=#12073

It seems to state that the wrong AGP-to-CPU bridge driver is being used and there is some way to fix it. This link goes to a brief synopsis of an article on tomshardware.com. Hope this helps.

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Regards,

clutch