Terascale Cluster
Combining the power of 1,100 Apple G5 computers, the Terascale Cluster project is bringing Virginia Tech to the forefront in the supercomputing arena.
At only $5m it's the cheapest Supercomputer in the world.
sorry it's apple g5's but this would make one hell of a folder
http://computing.vt.edu/research_computing/terascale/
I cant find anything on the actual computational power of the cluster