The Top500 supercomputer rankings list still has IBM's Blue Gene/L supercomputer as number one. The supercomputer, which is a joint venture between IBM and Department of Energy's National Nuclear Security Administration, has managed to receive a performance score of 136.8 teraflops per second with the Linpack benchmark. The system is currently located in Department of Energy's Lawrence Livermore National Laboratory in Livermore. Second place in the list is currently taken up by another Blue Gene system.

The No. 1 position was again claimed by the BlueGene/L System, a joint development of IBM and DOE's National Nuclear Security Administration (NNSA) and installed at DOE's Lawrence Livermore National Laboratory in Livermore, Calif. BlueGene/L also occupied the No. 1 position on the last TOP500 list issued in November 2004. However, the system was doubled in size during the last six months and reached a new record Linpack benchmark performance of 136.8 TFlop/s ("teraflops" or trillions of calculations per second). This system, once completed, will again be doubled in size and is expected to remain the #1 Supercomputer in the world for the next few editions of the TOP500 list.