The Original Mac Mini G4 had a single-core 32-Bit PowerPC CPU at some 1.25 GHz with 512 KB on-chip Cache. It was released in 2005.
It has a Geekbench Score of 766.
The Raspberry Pi basically is a a cellphone, without the battery and the packaging. The Raspberry Pi 3 was released in 2016, and has a BCM 2837 with a quadcore ARM with 1.2 GHz.
It has a Geekbench Score of 2128.
In case you need to illustrate how Moore’s Law works, in a practical, touchable way.