the die is actually smaller then 2 Merom stuck together to form a MCM quad core Kentsfield. The socket and package are larger due to all the extra pins needed to run 2 QPI lanes and 3 memory channels.
EDIT: oh you ment Tylersburg. Well it needs to carry IO for 2 QPI lanes, the logic for PCI control and all the logic required to control the power and clocks for all the seperate parts of 2 Nehalem die.






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