How it the TDP number determined? How can the 8 core CPU be 105W and the 16 core CPU be 105W too? Why isn't the maximum power draw of 16 cores roughly double the power draw of 8 cores?
GamersNexus has a pretty good article on TDP [1]. It can be summarized as being a mostly marketing number that is useful in a few specific ways. This is applicable to both AMD and Intel.