Dementia is actually a decent metaphor for what happens to an aging chip.
Internally, a chip is extremely dependent on gate timings. As the chip decays, certain gates or wires will start to slow down or speed up, and the chip gets sloppier.
Often, you can address the issue by slowing the chip clock rate down, because this gives you a much wider margin for error on your gate timings.
Certain operations will be impacted sooner and more heavily than others. Eventually, the timings get bad enough that certain operations (or even the whole chip) just break altogether.
Internally, a chip is extremely dependent on gate timings. As the chip decays, certain gates or wires will start to slow down or speed up, and the chip gets sloppier.
Often, you can address the issue by slowing the chip clock rate down, because this gives you a much wider margin for error on your gate timings.
Certain operations will be impacted sooner and more heavily than others. Eventually, the timings get bad enough that certain operations (or even the whole chip) just break altogether.