It looks like the trend of making more energy efficient PCs has spread from common laptops, desktops and servers, all the way up to supercomputers. The system is designed for defense and scientific research.
"Called Maxwell, the computer has been built at the University of Edinburgh and uses field programmable gate arrays (FPGA) in place of conventional processors.
Its Scottish developers believe Maxwell represents a new generation of compact and energy-efficient computers. Unlike ordinary general-purpose processors, FPGA chips can be programmed to perform very specific tasks. Once that programming is accomplished, FPGA chips can be much faster than performing the same tasks in software running on general-purpose chips."