oversitting
Banned
No. That's a myth. That story began at the start of the PS360 generation and it's wrong.
Sony announced they have been collaborating with Nvidia on a GPU for the next playstation in 2004, two years before it launched. That's not last minute. All console companies come up with multiple designs. It's true they had thought about creating their own GPU or using a Cell as a GPU, but I think they realized it would be unfeasible pretty early. The whole story is really BS that I think was started to make an explanation for why Sony's console had the weaker GPU, since Xenos was obviously superior from the announcement of the specs.
that is pretty last minute.