[p1necone]

I imagine some tiny percentage would instead be dissipated as light/radio waves or sound too - hence my ~99% comment.

There's also this: (https://en.wikipedia.org/wiki/Landauer%27s_principle) if you want some light reading.

[pooppaint]

Indeed there will be some piezoelectric effect and some EM emissions on the order of micro watts compared to the 10s of watts burned by the CPU. But the poster I was replying to seemed quite confused about the fate of power in a CPU used for computation: It’s dissipated as heat.