Solved! Core i7 vs core 2 quad or duo notebooks

AntiZig

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Major difference between quad and duo is duo is 2 core processor, quad is a 4 core processor. Typically each core can run 2 threads, so on a duo you will can have 4 threads and quad will have 8 threads.

More detailed here:
http://ark.intel.com/Compare.aspx?ids=42599,37033,52219,