They just moved that silicon to the CPU side is all. The same issues existed in the northbridge days particularly in multi-CPU setups where you'd have to go ove

They just moved that silicon to the CPU side is all. The same issues existed in the northbridge days particularly in multi-CPU setups where you'd have to go over hyper transport if the memory access was on the other controller. Not saying these issues don't exist. It's just that they really haven't changed much here except moved logic from the motherboard to the CPU itself.