Its not that odd, since they made it under contract for Dell. Many companies do this sort of thing, they take no responsibility for the product because they are not marketing it, nor are they providing service or support for it. They simply build the product to their customer's specs(in this case Dell) Then the customer markets the product as their own. That is NOT an ATi card, it is a Dell card with an ATi chip. That is why ATi will not look at the card.
this is done by several companies and not only in the computer industry.