Some of the world’s fastest supercomputers are among ASC’s accomplishments in advanced computing. However, it is not all about speed. Each new system is engineered to bring certain capabilities to bear on the problems of modeling and simulation that will enhance the overall goals of the Science-Based Stockpile Stewardship Program. In doing so, ASC will continue to challenge the state of art for computer scientists and manufacturers with systems such as those described below:
On June 18, 2012, Sequoia was ranked number one on the TOP500 list, clocking in at 16.32 sustained petaflops. Sequoia currently ranks number three on the TOP500 list. The 96-rack Blue Gene/Q system is dedicated to ASC for stewardship of the nation’s nuclear weapon stockpile and will enable simulations that explore phenomena at a level of detail never before possible.
As an initial delivery system for Sequoia Dawn was ranked 77th on the TOP500 list of the world's fastest computers. Dawn was an IBM BlueGene/P machine with a peak performance of 501 teraflops prior to it retirement August 30, 2013. Dawn was used to prepare applications for the Sequoia system, and was an important computational resource for the ASC program.
Sequoia Website 
Cielo, currently ranked 26th in the world with a peak performance of 1.37 petaflops, was authorized in 2011 to conduct classified operations  for NNSA. NNSA selected Cray Inc. to build Cielo in spring 2010. The selection was made through a highly competitive procurement process. Design, procurement and deployment were accomplished by the NNSA’s New Mexico Alliance for Computing at Extreme Scale (ACES). ACES is a joint partnership between Los Alamos National Laboratory and Sandia National Laboratories.
Cielo Website