The Green500 List - November 2007
The inaugural Green500 was announced on November 15, 2007 at SC|07. As a complement to the TOP500, the unveiling of the Green500 ushers in a new era where supercomputers can be compared by performance-per-watt.
For this inaugural list, performance is measured in floating point operations per seconds as reported by the TOP500 and power is measured in watts consumed during a Linpack run (if submitted) or peak power consumption of the supercomputer otherwise.
Listed below are the The Green500's Top 10 most energy-efficient supercomputers in the world as of November 2007.
| Green500 Rank | MFLOPS/W | Site* | Computer* | Total Power (kW) |
| 1 | 357.23 | Science and Technology Facilities Council - Daresbury Laboratory | "Blue Gene/P Solution | 31.10 |
| 2 | 352.25 | Max-Planck-Gesellschaft MPI/IPP | "Blue Gene/P Solution | 62.20 |
| 3 | 346.95 | IBM - Rochester | "Blue Gene/P Solution | 124.40 |
| 4 | 336.21 | Forschungszentrum Juelich (FZJ) | "Blue Gene/P Solution | 497.60 |
| 5 | 310.93 | Oak Ridge National Laboratory | "Blue Gene/P Solution | 70.47 |
| 6 | 210.56 | Harvard University | "eServer Blue Gene Solution | 44.80 |
| 7 | 210.56 | High Energy Accelerator Research Organization /KEK | "eServer Blue Gene Solution | 44.80 |
| 8 | 210.56 | IBM - Almaden Research Center | "eServer Blue Gene Solution | 44.80 |
| 9 | 210.56 | IBM Research | "eServer Blue Gene Solution | 44.80 |
| 10 | 210.56 | IBM Thomas J. Watson Research Center | "eServer Blue Gene Solution | 44.80 |
* Performance data obtained from publicly available sources including TOP500
