While the launch of Yonah still won?t be until January of next year, we?ve had a chip for the past month, unfortunately, we haven?t had a motherboard to stick it in. We finally got one two days ago, which is why you?re seeing this article now, instead of more pictures of our Yonah posing alongside the Xbox 360. The problem is that Intel seems to have changed sockets once more, meaning that Yonah is not backwards compatible with the original Pentium M socket.

AnandTech