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Designers now accept that although transistors will still get smaller and more numerous on each chip, they aren't going to operate faster than they do toady.And if you tried to incorporate all those transistors into one giant microprocessor, you might well end up with a device that couldn't compute any faster than the chip it was replacing, which explains the shift to assembling them into multiple microprocessor cores instead.
David Patterson (Tue,) studied this question.