An article about Purdue in CHE:
A group of information-technology specialists at Purdue University has found a way to beat the heat for a university data center’s two supercomputers. This summer, when temperatures rose and the campus cooling system wasn’t doing enough to bring them down, Purdue’s IT team reined in the clusters’ computing speeds to cut down on the heat the computers were generating.
For the rest of the story…
http://chronicle.com/blogPost/Supercomputers-Slow-Down-to/26363