High Quality Content by WIKIPEDIA articles! Jaguar is a petascale supercomputer built by Cray at Oak Ridge National Laboratory in Oak Ridge, Tennessee. As of November 2009[update], it was the world's fastest computer with a peak performance of more than 1750 teraflops (1.75 petaflops). A Cray XT5 system, Jaguar has 224,256 Opteron processor cores, and operates with a version of Linux called Cray Linux Environment.