This won't happen for a few reasons. Dell has no interest in doing such things, they like to be able to offer a diverse computing experience across their products. Intel, AMD, ATI, Nvidia, they have them all.
Another point, is that AMD and ATI still haven't REALLY integrated yet, their offices are still distance, and R&D for both sides still have their own buildings. The only venture with both sides of the company has been the recent APU.
EDIT: Look at TweekTown's sources. I would hardly trust either of those sites. The Fool has been known for made investment judgement.