Essentially, it keeps the same format and LGA1366 socket as the uni-processor Core i7, just dual CPU support and two QPI links per chip this time - one to talk to the Tylersburg chipset, another for high speed whispering to its twin Nehalem brother.
Even the workstation flavour of the Tylersburg is identical to the desktop one (X58) plus of course an extra QPI link to talk to that second CPU - or the second Tylersburg in dual North Bridge configuration for, say, quad PCIe x16 monster boards. Just count the PCIe lanes on this diagram.
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