
AMD would stand to benefit for such a deal as well. It will have access to Samsung's infinitely larger pockets when it needs funds for research and development. If Samsung's spending habits are any indication the company doesn't shy away from putting money towards R&D. Thus AMD will be able to push its technology even further. Samsung would obviously benefit from it as it will have dibs on AMD chips and will also be able to sell them to OEMs.
I should point out here that this is pure speculation. No official statement has come in yet from AMD and Samsung. The companies haven't even denounced the rumor so take it with a grain of salt for now.