Little Green500 List - November 2009
Listed below are the Little Green500's Top 10 most energy-efficient supercomputers in the world as of November 2009.
| Green500 Rank | MFLOPS/W | Site* | Computer* | Total Power (kW) |
| 1 | 722.98 | Forschungszentrum Juelich (FZJ) | QPACE SFB TR Cluster, PowerXCell 8i, 3.2 GHz, 3D-Torus | 59.49 |
| 1 | 722.98 | Universitaet Regensburg | QPACE SFB TR Cluster, PowerXCell 8i, 3.2 GHz, 3D-Torus | 59.49 |
| 1 | 722.98 | Universitaet Wuppertal | QPACE SFB TR Cluster, PowerXCell 8i, 3.2 GHz, 3D-Torus | 59.49 |
| 4 | 536.24 | Interdisciplinary Centre for Mathematical and Computational Modelling, University of Warsaw | BladeCenter QS22 Cluster, PowerXCell 8i 4.0 Ghz, Infiniband | 34.63 |
| 5 | 530.33 | Repsol YPF | BladeCenter QS22 Cluster, PowerXCell 8i 3.2 Ghz, Infiniband | 26.38 |
| 5 | 530.33 | Repsol YPF | BladeCenter QS22 Cluster, PowerXCell 8i 3.2 Ghz, Infiniband | 26.38 |
| 5 | 530.33 | Repsol YPF | BladeCenter QS22 Cluster, PowerXCell 8i 3.2 Ghz, Infiniband | 26.38 |
| 8 | 488.14 | Fraunhofer ITWM | BladeCenter QS22 Cluster, PowerXCell 8i 3.2 Ghz, Infiniband | 18.97 |
| 8 | 488.14 | IBM Germany | BladeCenter QS22 Cluster, PowerXCell 8i 3.2 Ghz, Infiniband | 22.76 |
| 10 | 458.33 | DOE/NNSA/LANL | BladeCenter QS22/LS21 Cluster, PowerXCell 8i 3.2 Ghz / Opteron DC 1.8 GHz, Infiniband | 276.00 |
| 10 | 458.33 | IBM Poughkeepsie Benchmarking Center | BladeCenter QS22/LS21 Cluster, PowerXCell 8i 3.2 Ghz / Opteron DC 1.8 GHz, Infiniband | 138.00 |
* Performance data obtained from publicly available sources including TOP500
