In 2003, Apple released a 64-bit dual-core 1.8Ghz system: Power Mac G5.

In 2023, Apple released a 64-bit dual-core 1.8Ghz system: Apple Watch Series 9.

The Watch is faster and has more RAM.

The G5 was too hot to put in a laptop. It'd use up S9's battery in under 2 minutes.

@kornel @jimbob tbh i’m surprised a current watch battery has enough electrons in it to run the fans on a G5 for 2 minutes, let alone the rest of it
@rfc6919 @jimbob I calculated it for the best-case scenario of 30W power draw of the CPU alone. The G5 came with a 450W power supply — no match for the 1Wh watch battery.

@kornel @rfc6919 @jimbob My G5 (dual core) runs at 220 watts. You may attach very large displays that will use the same power draw again.

Difference: You probably won‘t be using a Watch in 20 years. You still may run the G5 using a current Debian.