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Parallelism is a must.The era of scaling clockspeed is over. S.Borkar from Intel showed some very interesting graphs regarding scaling in general. In particular, for clock-speed, in the early days there used to be a quadratic increase in clock-speed for every reduction in technology-size. That then went down to a linear increase. Nowadays, there is no increase, clock-speeds can not be raised as you go to a smaller technology-size, and it might even be foreseeable in the future that clock-speeds might decrease with further reduction in technology size.