| Rank | Site | Computer | Cores | Year | Rmax | Rpeak | | 1 | DOE/NNSA/LLNL United States | BlueGene/L - eServer Blue Gene Solution IBM | 131072 | 2005 | 280.60 | 367.00 |
| 2 | IBM Thomas J. Watson Research Center United States | BGW - eServer Blue Gene Solution IBM | 40960 | 2005 | 91.29 | 114.69 |
| 3 | DOE/NNSA/LLNL United States | ASC Purple - eServer pSeries p5 575 1.9 GHz IBM | 12208 | 2006 | 75.76 | 92.78 |
| 4 | NASA/Ames Research Center/NAS United States | Columbia - SGI Altix 1.5 GHz, Voltaire Infiniband SGI | 10160 | 2004 | 51.87 | 60.96 |
| 5 | Commissariat a l'Energie Atomique (CEA) France | Tera-10 - NovaScale 5160, Itanium2 1.6 GHz, Quadrics Bull SA | 8704 | 2006 | 42.90 | 55.71 |
| 6 | Sandia National Laboratories United States | Thunderbird - PowerEdge 1850, 3.6 GHz, Infiniband Dell | 9024 | 2006 | 38.27 | 64.97 |
| 7 | GSIC Center, Tokyo Institute of Technology Japan | TSUBAME Grid Cluster - Sun Fire X64 Cluster, Opteron 2.4/2.6 GHz, Infiniband NEC/Sun | 10368 | 2006 | 38.18 | 49.87 |
| 8 | Forschungszentrum Juelich (FZJ) Germany | JUBL - eServer Blue Gene Solution IBM | 16384 | 2006 | 37.33 | 45.88 |
| 9 | Sandia National Laboratories United States | Red Storm Cray XT3, 2.0 GHz Cray Inc. | 10880 | 2005 | 36.19 | 43.52 |
| 10 | The Earth Simulator Center Japan | Earth-Simulator NEC | 5120 | 2002 | 35.86 | 40.96 |
| 11 | Barcelona Supercomputer Center Spain | MareNostrum - JS20 Cluster, PPC 970, 2.2 GHz, Myrinet IBM | 4800 | 2005 | 27.91 | 42.14 |
| 12 | ASTRON/University Groningen Netherlands | Stella - eServer Blue Gene Solution IBM | 12288 | 2005 | 27.45 | 34.41 |
| 13 | Oak Ridge National Laboratory United States | Jaguar - Cray XT3, 2.4 GHz Cray Inc. | 5200 | 2005 | 20.53 | 24.96 |
| 14 | Lawrence Livermore National Laboratory United States | Thunder - Intel Itanium2 Tiger4 1.4GHz - Quadrics California Digital Corporation | 4096 | 2004 | 19.94 | 22.94 |
| 15 | Computational Biology Research Center, AIST Japan | Blue Protein - eServer Blue Gene Solution IBM | 8192 | 2005 | 18.20 | 22.94 |
| 16 | Ecole Polytechnique Federale de Lausanne Switzerland | eServer Blue Gene Solution IBM | 8192 | 2005 | 18.20 | 22.94 |
| 17 | High Energy Accelerator Research Organization /KEK Japan | KEK/BG Sakura - eServer Blue Gene Solution IBM | 8192 | 2006 | 18.20 | 22.94 |
| 18 | High Energy Accelerator Research Organization /KEK Japan | KEK/BG MOMO - eServer Blue Gene Solution IBM | 8192 | 2006 | 18.20 | 22.94 |
| 19 | IBM Rochester, On Demand Deep Computing Center United States | eServer Blue Gene Solution IBM | 8192 | 2006 | 18.20 | 22.94 |
| 20 | ERDC MSRC United States | Cray XT3, 2.6 GHz Cray Inc. | 4096 | 2005 | 16.98 | 21.30 |
| 21 | COLSA United States | MACH5 - Apple XServe, 2.0 GHz, Myrinet Self-made | 3072 | 2005 | 16.18 | 24.58 |
| 22 | Korea Meteorological Administration Korea, South | Cray X1E (4GB) Cray Inc. | 1020 | 2005 | 15.71 | 18.44 |
| 23 | Indiana University United States | Big Red - BladeCenter JS21 Cluster, PPC 970, 2.5 GHz, Myrinet IBM | 2048 | 2006 | 15.04 | 20.48 |
| 24 | Oak Ridge National Laboratory United States | Cray X1E (2GB) Cray Inc. | 1014 | 2005 | 14.96 | 18.33 |
| 25 | Los Alamos National Laboratory United States | ASCI Q - AlphaServer SC45, 1.25 GHz Hewlett-Packard | 8192 | 2002 | 13.88 | 20.48 |
| 26 | University of Southern California United States | HPC - Pentium4 Xeon, EM64T, Opteron, Opteron dual core, Cluster, Myrinet Sun Microsystems | 5328 | 2006 | 13.81 | 21.31 |
| 27 | Geoscience (E) United States | BladeCenter LS20, Opteron 2.2 GHz Dual core, GigEthernet IBM | 5000 | 2005 | 12.31 | 22.00 |
| 28 | Virginia Tech United States | System X - 1100 Dual 2.3 GHz Apple XServe/Mellanox Infiniband 4X/Cisco GigE Self-made | 2200 | 2004 | 12.25 | 20.24 |
| 29 | Japan Atomic Energy Research Institute Japan | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink SGI | 2048 | 2005 | 11.81 | 13.11 |
| 30 | Atomic Weapons Establishment United Kingdom | Cray XT3, 2.6 GHz Cray Inc. | 2652 | 2006 | 11.81 | 13.79 |
| 31 | IBM - Rochester United States | BlueGene/L DD1 Prototype (0.5GHz PowerPC 440 w/Custom) IBM | 8192 | 2004 | 11.68 | 16.38 |
| 32 | Wright-Patterson Air Force Base/DoD ASC United States | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink SGI | 2048 | 2003 | 11.65 | 13.11 |
| 33 | US Army Research Laboratory (ARL) United States | John Von Neumann - LNX Cluster, Xeon 3.6 GHz, Myrinet Linux Networx | 2048 | 2005 | 10.65 | 14.75 |
| 34 | Center for Computational Science, University of Tsukuba Japan | PACS-CS, low voltage Xeon 2.8 GHz, 3D Hyper-Crossbar Hitachi/Fujitsu | 2560 | 2006 | 10.35 | 14.34 |
| 35 | China Meteorological Administration China | eServer pSeries 655 (1.7 GHz Power4+) IBM | 3200 | 2005 | 10.31 | 21.76 |
| 36 | Naval Oceanographic Office (NAVOCEANO) United States | eServer pSeries 655 (1.7 GHz Power4+) IBM | 2944 | 2004 | 10.31 | 20.02 |
| 37 | NCSA United States | Tungsten - PowerEdge 1750, P4 Xeon 3.06 GHz, Myrinet Dell | 2500 | 2003 | 9.82 | 15.30 |
| 38 | High Energy Accelerator Research Organization /KEK Japan | KEK/BG UME - eServer Blue Gene Solution IBM | 4096 | 2006 | 9.36 | 11.47 |
| 39 | IBM - Almaden Research Center United States | eServer Blue Gene Solution IBM | 4096 | 2005 | 9.36 | 11.47 |
| 40 | IBM Research Switzerland | eServer Blue Gene Solution IBM | 4096 | 2005 | 9.36 | 11.47 |
| 41 | IBM Thomas J. Watson Research Center United States | eServer Blue Gene Solution IBM | 4096 | 2005 | 9.36 | 11.47 |
| 42 | ECMWF United Kingdom | eServer pSeries 690 (1.9 GHz Power4+) IBM | 2176 | 2004 | 9.24 | 16.54 |
| 43 | ECMWF United Kingdom | eServer pSeries 690 (1.9 GHz Power4+) IBM | 2176 | 2004 | 9.24 | 16.54 |
| 44 | UCSD/San Diego Supercomputer Center United States | DataStar - eServer pSeries 655/690 (1.5/1.7 GHz Power4+) IBM | 2464 | 2005 | 9.12 | 15.63 |
| 45 | Japan Meteorological Agency Japan | SR11000-K1/80 Hitachi | 80 | 2005 | 9.04 | 10.75 |
| 46 | Japan Meteorological Agency Japan | SR11000-K1/80 Hitachi | 80 | 2005 | 9.04 | 10.75 |
| 47 | Australian Partnership for Advanced Computing (APAC) Australia | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink SGI | 1536 | 2005 | 8.97 | 9.83 |
| 48 | HWW/Universitaet Stuttgart Germany | SX8/576M72 NEC | 576 | 2005 | 8.92 | 9.22 |
| 49 | Institute of Physical and Chemical Res. (RIKEN) Japan | RIKEN Super Combined Cluster Fujitsu | 2048 | 2004 | 8.73 | 12.53 |
| 50 | Pacific Northwest National Laboratory United States | Mpp2 - Cluster Platform 6000 rx2600 Itanium2 1.5 GHz, Quadrics Hewlett-Packard | 1936 | 2003 | 8.63 | 11.62 |
| 51 | Georgia Institute of Technology United States | BladeCenter LS20, Opteron 2.0 GHz Dual core, GigEthernet IBM | 3920 | 2006 | 8.51 | 15.68 |
| 52 | Caltech United States | CITerra - PowerEdge 1850, 3.2 GHz, Myrinet Dell | 2048 | 2005 | 8.41 | 13.11 |
| 53 | Shanghai Supercomputer Center China | Dawning 4000A, Opteron 2.2 GHz, Myrinet Dawning | 2560 | 2004 | 8.06 | 11.26 |
| 54 | Los Alamos National Laboratory United States | Lightning - Opteron 2 GHz, Myrinet Linux Networx | 2816 | 2003 | 8.05 | 11.26 |
| 55 | Pittsburgh Supercomputing Center United States | Cray XT3, 2.4 GHz Cray Inc. | 2060 | 2005 | 7.94 | 9.89 |
| 56 | Wright-Patterson Air Force Base/DoD ASC United States | Cluster Platform 4000 DL145 Opteron 2.8 GHz Infiniband Hewlett-Packard | 2048 | 2006 | 7.93 | 11.47 |
| 57 | University at Buffalo, SUNY, Center for Computational Res. United States | U2 - PowerEdge SC1425 3.2 GHz, Myrinet Dell | 1536 | 2006 | 7.74 | 9.83 |
| 58 | Lawrence Livermore National Laboratory United States | MCR Linux Cluster Xeon 2.4 GHz - Quadrics Linux Networx | 2304 | 2002 | 7.63 | 11.06 |
| 59 | HPCx United Kingdom | eServer pSeries p5 575 1.5 GHz IBM | 1536 | 2005 | 7.40 | 9.22 |
| 60 | Lawrence Livermore National Laboratory United States | ASCI White, SP Power3 375 MHz IBM | 8192 | 2000 | 7.30 | 12.29 |
| 61 | NERSC/LBNL United States | Seaborg - SP Power3 375 MHz 16 way IBM | 6656 | 2002 | 7.30 | 9.98 |
| 62 | NCSA United States | TeraGrid, Itanium2 1.3/1.5 GHZ, Myrinet IBM | 1776 | 2004 | 7.22 | 10.26 |
| 63 | US Army Research Laboratory (ARL) United States | eServer Opteron 2.2 GHz. Myrinet IBM | 2320 | 2004 | 7.19 | 10.21 |
| 64 | Swiss Scientific Computing Center (CSCS) Switzerland | Cray XT3, 2.6 GHz Cray Inc. | 1664 | 2006 | 7.05 | 8.65 |
| 65 | Texas Advanced Computing Center/Univ. of Texas United States | Lonestar2 - PowerEdge 1855, 3.2 GHz, Infiniband Dell | 1300 | 2006 | 6.99 | 8.32 |
| 66 | University of Sherbrooke Canada | Mp - PowerEdge SC1425 3.6 GHz- Infiniband Dell | 1152 | 2005 | 6.89 | 8.29 |
| 67 | Nagoya University Japan | PRIMEPOWER HPC2500 (2.08 GHz) Fujitsu | 1664 | 2005 | 6.86 | 13.84 |
| 68 | Intel United States | Endeavor - Intel Cluster, Xeon 3.0 GHz dual core, Infiniband Intel | 928 | 2006 | 6.86 | 11.14 |
| 69 | Los Alamos National Laboratory United States | Coyote A - Opteron 2.6 GHz, Infiniband Linux Networx | 1620 | 2005 | 6.68 | 8.42 |
| 70 | Joint Supercomputer Center Russia | MVS-15000BM, eServer BladeCenter JS20 (PowerPC970 2.2 GHz), Myrinet IBM | 1148 | 2006 | 6.65 | 10.10 |
| 71 | Lawrence Livermore National Laboratory United States | xSeries Cluster Xeon 2.4 GHz - Quadrics IBM | 1920 | 2003 | 6.59 | 9.22 |
| 72 | NERSC/LBNL United States | eServer pSeries p5 575 1.9 GHz IBM | 976 | 2005 | 6.42 | 7.42 |
| 73 | NASA/Goddard Space Flight Center United States | Explore - SGI Altix 3700 Bx2, 1.5 GHz, NUMAlink, Infiniband SGI | 1152 | 2005 | 6.31 | 6.91 |
| 74 | University of North Carolina United States | Topsail - PowerEdge 1855, 3.6 GHz, Infiniband Dell | 1040 | 2006 | 6.25 | 7.49 |
| 75 | Lawrence Livermore National Laboratory United States | Lilac - xSeries x335 Cluster, Xeon 3.06 GHz, Quadrics IBM | 1540 | 2004 | 6.23 | 9.43 |
| 76 | HPCx United Kingdom | eServer pSeries 690 (1.7 GHz Power4+) IBM | 1600 | 2004 | 6.19 | 10.88 |
| 77 | Grid Technology Research Center, AIST Japan | AIST Super Cluster P-32 - AIST Super Cluster P-32, Opteron 2.0 GHz, Myrinet IBM | 2200 | 2004 | 6.16 | 8.80 |
| 78 | NCSA United States | Tungsten 2 - PowerEdge 1850, 3.6 GHz, Infiniband Dell | 1024 | 2005 | 6.12 | 7.37 |
| 79 | NCSA United States | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink SGI | 1024 | 2005 | 6.12 | 6.55 |
| 80 | SharcNet Canada | Whale - Cluster Platform 4000 DL145 Opteron 2.2 GHz Dual Core GigEthernet Hewlett-Packard | 3072 | 2006 | 6.02 | 13.52 |
| 81 | Tohoku University, Institute of Fluid Science Japan | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink, 10GigEthernet SGI | 1024 | 2006 | 6.01 | 6.55 |
| 82 | Telecommunication Company United States | Blade Cluster BL-20P, Pentium4 Xeon 3.2 GHz, GigEthernet Hewlett-Packard | 1728 | 2006 | 5.97 | 11.06 |
| 83 | SharcNet Canada | Requin - Cluster Platform 4000 DL145, Opteron 2,6 GHz, Quadrics Hewlett-Packard | 1536 | 2006 | 5.75 | 7.99 |
| 84 | Lawrence Livermore National Laboratory United States | eServer pSeries p5 575 1.9 GHz IBM | 864 | 2005 | 5.74 | 6.57 |
| 85 | Seoul National University Korea, South | eServer BladeCenter JS20 (PowerPC970 2.2 GHz), Myrinet IBM | 968 | 2005 | 5.62 | 8.52 |
| 86 | Forschungszentrum Juelich (FZJ) Germany | JUMP - eServer pSeries 690 (1.7 GHz Power4+) IBM | 1312 | 2004 | 5.57 | 8.92 |
| 87 | Brigham Young University United States | Marylou4 - PowerEdge 1855, 3.6 GHz, GigEthernet Dell | 1260 | 2005 | 5.44 | 9.07 |
| 88 | University of Oklahoma United States | Topdawg - PowerEdge 1850, 3.2 GHz, Infiniband Dell | 1024 | 2005 | 5.44 | 6.55 |
| 89 | National Aerospace Laboratory of Japan Japan | PRIMEPOWER HPC2500 (1.3 GHz) Fujitsu | 2304 | 2002 | 5.41 | 11.98 |
| 90 | Sun United States | SSC_V40z+x4100 - Fire V40x/X4100 Cluster Opteron 2.4GHz dual core, Infiniband Sun Microsystems | 1536 | 2006 | 5.40 | 7.37 |
| 91 | KTH - Royal Institute of Technology Sweden | Lenngren - PowerEdge 1850, 3.4 GHz, Infiniband Dell | 886 | 2005 | 5.00 | 6.03 |
| 92 | Japan Meteorological Agency Japan | SR11000-J1/50 Hitachi | 50 | 2005 | 4.99 | 6.08 |
| 93 | Financial Services (M) United Kingdom | BladeCenter LS20, Opteron 2.2 GHz Dual core, GigEthernet IBM | 2000 | 2006 | 4.92 | 8.80 |
| 94 | Financial Services (M) United Kingdom | BladeCenter LS20, Opteron 2.2 GHz Dual core, GigEthernet IBM | 2000 | 2006 | 4.92 | 8.80 |
| 95 | Adam Opel AG Germany | eServer pSeries p5 575 1.9 GHz IBM | 720 | 2005 | 4.78 | 5.47 |
| 96 | Los Alamos National Laboratory United States | Coyote B - Opteron 2.6 GHz, Infiniband Linux Networx | 1080 | 2005 | 4.72 | 5.62 |
| 97 | Argonne National Laboratory United States | eServer Blue Gene Solution IBM | 2048 | 2005 | 4.71 | 5.73 |
| 98 | Boston University United States | eServer Blue Gene Solution IBM | 2048 | 2005 | 4.71 | 5.73 |
| 99 | Iowa State University United States | CyBlue - eServer Blue Gene Solution IBM | 2048 | 2006 | 4.71 | 5.73 |
| 100 | MIT United States | eServer Blue Gene Solution IBM | 2048 | 2005 | 4.71 | 5.73 |