Demonstrate the Power of a Linux based Load balancing cluster

I have to demonstrate the power of a cluster, i.e its advantage over a normal machine.

Is there any way I can show,to the layman that "If this had been done on a normal workstation, it would have taken X hours and with this cluster its the nth fraction of the x hrs taken"?

Please suggest some simulations/renders/computational tests that can give concrete 开发者_开发百科figures to support the above argument.

Some ideas: the Beowulf.org website, the Linux High Performance Computing website, the Top500 Related Papers (not really Linux specific but there are some interesting data).