Mac High Performance Computing (HPC)

Virginia Tech Apple G5 super computer cluster

Virginia Tech G5 supercomputer upgraded to 2.3GHz Xserves

http://www.appleinsider.com/articles/04/09/28/virginia_tech_g5_supercomputer_upgraded_to_23ghz_xserves.html

http://www.apple.com/science/profiles/vatech2/

Virginia Tech building supercomputer out of 324 Mac Pros

http://arstechnica.com/apple/2008/07/virginia-tech-building-supercomputer-out-of-324-mac-pros/