Plain and simple, the i5 numbers come from the same person that showed off the i7 numbers and the number from the retail parts where same/better then the ES shown by that person.
i5 is the replacement for S775, i7 is just a byproduct from Serverparts (Xeons). I expect them to have the exact same frequenzy as the i7s, maybe one notch lower (no 3,2ghz part).
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