The funny thing is, it wouldn’t.
Ivy Bridge-EP has a bit of a trick up its sleeve - the architecture is very amenable to frequency scaling on better silicon and will benefit from that frequency gain in real world performance. As it natively supports quad channel memory amongst other features it isn't held back as other consumer CPUs would be if given similar treatment.
EDIT: Though that would only be true up to 12 cores - beyond that it has some disadvantages a shrink couldn't overcome.
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