Dolphin is an emulator for GameCube and Wii. Their team ported Dolphin to the M1 and compared it to a high-end PC gaming rig:
The efficiency is almost literally off the chart. Compared to an
absolute monstrosity of a desktop PC, it uses less than 1/10th
of the energy while providing ~65% of the performance. And the
poor Intel MacBook Pro just can’t compare.
And, as the Dolphin team points out, Apple still hasn’t shown its silicon cards for high-end Macs. The M1 is the consumer Mac chip.