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How can I tell what 2011/2011-3 socket CPUs have 40pcie lane support?

Im not sure which CPUs have 28pcie lane support vs which ones have 40.

How can I determine this?
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    If cpu number is i7-
    x8xx, it has 28 lanes
    x9xx, it has 40 lanes

    (Note: Valid up until Haswell-E. Later series may come to differ from this.)

    Intel has a great site for detailed information on all their processors, http://ark.intel.com/. E-series (like Haswell-E) are listed under "Intel® High End Desktop Processors".
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