 However, in June 2018 the Department of Energy announced that the USA had retaken the crown of "world's fastest supercomputer" from China after IBM and the Oak Ridge National Laboratory (ORNL) unveiled "Summit", a new supercomputer that is claimed to be more than twice as powerful as the current world leader, with a peak performance of 200,000 trillion calculations per second.By comparison, China's Tianhe-2 has a processing power of 93 petaflops (93,000 trillion calculations per second).Tours of parts of the original facility are available to American citizens from March through November.