How cool is this?
Chris Fenton has built a fully functional 1/10th scale Cray-1A supercomputer.
The original machine ran at a blistering 80 MHz, and could use from 256-4096 kilowords (32 megabytes!) of memory. It has 12 independent, fully-pipelined execution units, and with the help of clever programming, can peak at 3 floating-point operations per cycle.
The only thing it's currently missing is the original software. Apparently SGI destroyed it and the CIA isn't talking.