"In practice replacing digital computers with an alternative computing paradigm is a risky proposition. Alternative computing architectures, such as parallel digital computers have not tended to be commercially viable, because Moore's Law has consistently enabled conventional von Neumann architectures to render alternatives unnecessary. Besides Moore's Law, digital computing also benefits from mature tools and expertise for optimizing performance at all levels of the system: process technology, fundamental circuits, layout and algorithms. Many engineers are simultaneously working to improve every aspect of digital technology, while alternative technologies like analog computing do not have the same kind of industry juggernaut pushing them forward."
--Benjamin Vigoda, "Analog Logic: Continuous-Time Analog Circuits for Statistical Signal Processing" (2003 PhD thesis)
Alternative computing architectures, such as parallel digital computers have not tended to be commercially viable, because Moore's Law has consistently enabled conventional von Neumann architectures to render alternatives unnecessary.
And the very next year, Intel abandoned its plans to make 4 GHz processors, and we've been stuck at around 3 GHz ever since.
Since when, parallel computing has indeed had the industry juggernaut behind it.
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