I'm surprised to see with all the RX 480 talk today, this isn't even in the rumors section.
If true, this could be a huge issue and may cost AMD a lot of money they don't have. I would imagine to correct the issue, they would either that to intentionally gimp the BIOS, do a recall and put an 8-pin connector on it, or something. Again, if true, this would make the 3.5GB issue the nVidia 970 had look tiny. Especially since there is a potential to cause damage to motherboards.With Tom's Hardware reporting that the RX 480 draws (substantially) more than the 75W allowed from the motherboard (for example, the PCI Express high-power card spec allows a maximum of 66W to be drawn from the 12V pins of the PCI Express slot, and the RX 480 averages 79W from the 12V lines alone) AMD seems to be violating the PCI Express(R) spec.
According to the licensing contract for the spec, if they do not fix this within 3 months, AMD will NOT be able to call the card a PCI Express card. If they do, they face not only litigation, but if my understanding is correct an action before the U.S. International Trade Commission (ITC) to ban the importation of the card as counterfeit goods. You might think the PCI-SIG will give AMD a pass, but if they do, they risk loosing the trademark entirely. An unforced trademark gets invalidated. The SIG won't let that happen.