XLC Gaming Network writes: NVIDIA today announced that the University of Oxford and a consortium of top U.K.-based academic institutions have deployed the nation’s most powerful GPU-accelerated supercomputer to enable advanced research across a range of scientific and engineering fields.
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http://en.wikipedia.org/wik...
Of course, they aren't 100% GPU based super computers, since GPU's aren't the best at EVERYTHING. CPU's are still needed for more serial tasks.
Also, the top spot is soon to be replaced by this monster:
http://en.wikipedia.org/wik...
Which will be comprised of mainly Tesla GPU's.