I&#x27;d say that it&#x27;s decreased, because of how tiny the transistors and interconnects are getting. The CPUs still work today (obviously), but the margins are much thinner than they used to be because they don&#x27;t design for more than a few years&#x27; lifespan.<p>The 486 was produced in a 1um (1000nm) to 600nm process and runs on 5V+&#x2F;-5% (4.75-5.25, a 250mV range), with an absolute maximum of 6.5V.<p>The 14nm Skylake has a core voltage of ~1V, tolerance of a few tens of mV, and an absolute maximum of 1.52V.<p>Electromigration will likely become a significant source of IC failures in the future.