Process–architecture–optimization is a development model for central processing units (CPUs) that Intel adopted in 2016.
Under this three-phase (three-year) model, every microprocessor die shrink is followed by a microarchitecture change and then by one or more optimizations.
It replaced the two-phase (two-year) tick–tock model that Intel adopted in 2006.
The tick–tock model was no longer economically sustainable, according to Intel, because production of ever smaller dies becomes ever more costly.
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