Experimenting with parallel computer clusters is still a cost effective way to carry out various simulations. Our "Monte" Cluster was built to carry out long-running Monte-Carlo (stochastic) simulations of growth and complexity in various models. This system has Apple Macintosh dual G5 nodes running at 2.4 GHz and with the OSX 10.4 Tiger Operating System running on them. Most of our codes are hand crafted simulations written in C, C++ or Java and perform well on this 64-bit architecture.
The images below show the front and rear of the 24-unit cabinet during construction, configuration and demonstration to students.