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PC sales began leveling off [asymco.com] in the late 1990s, more steeply after 2000. Long before smartphones and tablets.
What happened was Intel and AMD ran headfirst into physics. Prior to 2000, CPU clock speeds had been doubling roughly every 18 months. But the power a processor needs increases non-linearly with frequency [rice.edu]. Past about 3 GHz (roughly 2002), CPUs began to require exorbitant amounts of additional power for little gains in clock speed.
Consequently, the rate of clock speed increases nearly
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