For a comparison, the "similar" computer from 2006 [0] had a maximum configuration of 4xCPU @ 1 GHz and 8GB of RAM. It weighed 60 lb (27 kg) and looked like this:

https://imgur.com/fc7BWTc

But Raspberry Pi 500+ has already 2.4GHz quad-core ARM64 CPU and 16GB RAM.

[0]: https://en.wikipedia.org/wiki/SGI_Tezro