"Compute performance has a direct impact on our ability to tackle the greatest engineering and scientific challenges we face, resulting in the breakthroughs that change society," said Dr. Thomas Zacharia, Oak Ridge National Laboratory associate director for computing and computational sciences. "The scalability, reliability and upgradeability of the Cray XT4 has made Jaguar an increasingly powerful computing resource for our researchers and scientists. This upgrade will enable even greater achievements in today's most important areas of science."