| Rank | Site | Computer | Cores | Year | Rmax | Rpeak | | 1 | DOE/NNSA/LLNL United States | BlueGene/L - eServer Blue Gene Solution IBM | 65536 | 2005 | 136.80 | 183.50 |
| 2 | IBM Thomas J. Watson Research Center United States | BGW - eServer Blue Gene Solution IBM | 40960 | 2005 | 91.29 | 114.69 |
| 3 | NASA/Ames Research Center/NAS United States | Columbia - SGI Altix 1.5 GHz, Voltaire Infiniband SGI | 10160 | 2004 | 51.87 | 60.96 |
| 4 | The Earth Simulator Center Japan | Earth-Simulator NEC | 5120 | 2002 | 35.86 | 40.96 |
| 5 | Barcelona Supercomputer Center Spain | MareNostrum - JS20 Cluster, PPC 970, 2.2 GHz, Myrinet IBM | 4800 | 2005 | 27.91 | 42.14 |
| 6 | ASTRON/University Groningen Netherlands | Stella - eServer Blue Gene Solution IBM | 12288 | 2005 | 27.45 | 34.41 |
| 7 | Lawrence Livermore National Laboratory United States | Thunder - Intel Itanium2 Tiger4 1.4GHz - Quadrics California Digital Corporation | 4096 | 2004 | 19.94 | 22.94 |
| 8 | Computational Biology Research Center, AIST Japan | Blue Protein - eServer Blue Gene Solution IBM | 8192 | 2005 | 18.20 | 22.94 |
| 9 | Ecole Polytechnique Federale de Lausanne Switzerland | eServer Blue Gene Solution IBM | 8192 | 2005 | 18.20 | 22.94 |
| 10 | Sandia National Laboratories United States | Red Storm, Cray XT3, 2.0 GHz Cray Inc. | 5000 | 2005 | 15.25 | 20.00 |
| 11 | Oak Ridge National Laboratory United States | Cray XT3, 2.4 GHz Cray Inc. | 3748 | 2005 | 14.17 | 17.99 |
| 12 | Los Alamos National Laboratory United States | ASCI Q - AlphaServer SC45, 1.25 GHz Hewlett-Packard | 8192 | 2002 | 13.88 | 20.48 |
| 13 | Lawrence Livermore National Laboratory United States | eServer pSeries p5 575 1.9 GHz IBM | 2048 | 2005 | 13.09 | 15.56 |
| 14 | 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 |
| 15 | Japan Atomic Energy Research Institute Japan | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink SGI | 2048 | 2005 | 11.81 | 13.11 |
| 16 | IBM - Rochester United States | BlueGene/L DD1 Prototype (0.5GHz PowerPC 440 w/Custom) IBM/ LLNL | 8192 | 2004 | 11.68 | 16.38 |
| 17 | Wright-Patterson Air Force Base/DoD ASC United States | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink SGI | 2048 | 2003 | 11.65 | 13.11 |
| 18 | China Meteorological Administration China | eServer pSeries 655 (1.7 GHz Power4+) IBM | 3200 | 2005 | 10.31 | 21.76 |
| 19 | Naval Oceanographic Office (NAVOCEANO) United States | eServer pSeries 655 (1.7 GHz Power4+) IBM | 2944 | 2004 | 10.31 | 20.02 |
| 20 | NCSA United States | Tungsten - PowerEdge 1750, P4 Xeon 3.06 GHz, Myrinet Dell | 2500 | 2003 | 9.82 | 15.30 |
| 21 | IBM - Almaden Research Center United States | eServer Blue Gene Solution IBM | 4096 | 2005 | 9.36 | 11.47 |
| 22 | IBM - Deep Computing Capacity on Demand Center United States | eServer Blue Gene Solution IBM | 4096 | 2005 | 9.36 | 11.47 |
| 23 | IBM Thomas J. Watson Research Center United States | eServer Blue Gene Solution IBM/ LLNL | 4096 | 2005 | 9.36 | 11.47 |
| 24 | ECMWF United Kingdom | eServer pSeries 690 (1.9 GHz Power4+) IBM | 2176 | 2004 | 9.24 | 16.54 |
| 25 | ECMWF United Kingdom | eServer pSeries 690 (1.9 GHz Power4+) IBM | 2176 | 2004 | 9.24 | 16.54 |
| 26 | Australian Partnership for Advanced Computing (APAC) Australia | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink SGI | 1536 | 2005 | 8.97 | 9.83 |
| 27 | HWW/Universitaet Stuttgart Germany | SX8/576M72 NEC | 576 | 2005 | 8.92 | 9.22 |
| 28 | US Army Research Laboratory (ARL) United States | John Von Neumann - LNX Cluster, Xeon 3.4 GHz, Myrinet Linux Networx | 2048 | 2004 | 8.77 | 13.93 |
| 29 | Institute of Physical and Chemical Res. (RIKEN) Japan | RIKEN Super Combined Cluster Fujitsu | 2048 | 2004 | 8.73 | 12.53 |
| 30 | Pacific Northwest National Laboratory United States | Mpp2 - Cluster Platform 6000 rx2600 Itanium2 1.5 GHz, Quadrics Hewlett-Packard | 1936 | 2003 | 8.63 | 11.62 |
| 31 | Shanghai Supercomputer Center China | Dawning 4000A, Opteron 2.2 GHz, Myrinet Dawning | 2560 | 2004 | 8.06 | 11.26 |
| 32 | Los Alamos National Laboratory United States | Lightning - Opteron 2 GHz, Myrinet Linux Networx | 2816 | 2003 | 8.05 | 11.26 |
| 33 | Pittsburgh Supercomputing Center United States | Cray XT3, 2.4 GHz Cray Inc. | 2060 | 2005 | 7.94 | 9.89 |
| 34 | Lawrence Livermore National Laboratory United States | MCR Linux Cluster Xeon 2.4 GHz - Quadrics Linux Networx/Quadrics | 2304 | 2002 | 7.63 | 11.06 |
| 35 | Lawrence Livermore National Laboratory United States | ASCI White, SP Power3 375 MHz IBM | 8192 | 2000 | 7.30 | 12.29 |
| 36 | NERSC/LBNL United States | Seaborg - SP Power3 375 MHz 16 way IBM | 6656 | 2002 | 7.30 | 9.98 |
| 37 | University of Southern California United States | HPC - Sun Fire V60, IBM xServer,2.8-3.2 GHz, Myrinet IBM, Sun, Myricom | 2640 | 2005 | 7.29 | 14.78 |
| 38 | NCSA United States | TeraGrid, Itanium2 1.3/1.5 GHZ, Myrinet IBM | 1776 | 2004 | 7.22 | 10.26 |
| 39 | US Army Research Laboratory (ARL) United States | eServer Opteron 2.2 GHz. Myrinet IBM | 2320 | 2004 | 7.19 | 10.21 |
| 40 | University of Sherbrooke Canada | Mp - PowerEdge SC1425 3.6 GHz- Infiniband Dell | 1152 | 2005 | 6.89 | 8.29 |
| 41 | Nagoya University Japan | PRIMEPOWER HPC2500 (2.08 GHz) Fujitsu | 1664 | 2005 | 6.86 | 13.84 |
| 42 | Lawrence Livermore National Laboratory United States | xSeries Cluster Xeon 2.4 GHz - Quadrics IBM/Quadrics | 1920 | 2003 | 6.59 | 9.22 |
| 43 | UCSD/San Diego Supercomputer Center United States | DataStar - eServer pSeries 655/690 (1.5/1.7 Ghz Power4+) IBM | 1696 | 2004 | 6.39 | 10.41 |
| 44 | Lawrence Livermore National Laboratory United States | Lilac - xSeries x335 Cluster, Xeon 3.06 GHz, Quadrics IBM | 1540 | 2004 | 6.23 | 9.43 |
| 45 | HPCx United Kingdom | eServer pSeries 690 (1.7 GHz Power4+) IBM | 1600 | 2004 | 6.19 | 10.88 |
| 46 | 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 |
| 47 | NCSA United States | Tungsten 2 - PowerEdge 1850, 3.6 GHz, Infiniband Dell | 1024 | 2005 | 6.12 | 7.37 |
| 48 | NCSA United States | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink SGI | 1024 | 2005 | 6.12 | 6.55 |
| 49 | Lawrence Livermore National Laboratory United States | eServer pSeries p5 575 1.9 GHz IBM | 896 | 2005 | 5.92 | 6.81 |
| 50 | Oak Ridge National Laboratory United States | Cray X1 Cray Inc. | 504 | 2004 | 5.90 | 6.45 |
| 51 | Seoul National University Korea, South | eServer BladeCenter JS20 (PowerPC970 2.2 GHz), Myrinet IBM | 968 | 2005 | 5.62 | 8.52 |
| 52 | Forschungszentrum Juelich (FZJ) Germany | JUMP - eServer pSeries 690 (1.7 GHz Power4+) IBM | 1312 | 2004 | 5.57 | 8.92 |
| 53 | Brigham Young University United States | Marylou4 - PowerEdge 1855, 3.6 GHz, GigEthernet Dell | 1260 | 2005 | 5.44 | 9.07 |
| 54 | University of Oklahoma United States | Topdawg - PowerEdge 1850, 3.2 GHz, Infiniband Dell | 1024 | 2005 | 5.44 | 6.55 |
| 55 | National Aerospace Laboratory of Japan Japan | PRIMEPOWER HPC2500 (1.3 GHz) Fujitsu | 2304 | 2002 | 5.41 | 11.98 |
| 56 | Joint Supercomputer Center Russia | MVS-15000BM, eServer BladeCenter JS20 (PowerPC970 2.2 GHz), Myrinet IBM | 924 | 2005 | 5.36 | 8.13 |
| 57 | Swiss Scientific Computing Center (CSCS) Switzerland | Cray XT3, 2.6 GHz Cray Inc. | 1100 | 2005 | 4.78 | 5.72 |
| 58 | Argonne National Laboratory United States | eServer Blue Gene Solution IBM | 2048 | 2005 | 4.71 | 5.73 |
| 59 | Boston University United States | eServer Blue Gene Solution IBM | 2048 | 2005 | 4.71 | 5.73 |
| 60 | Forschungszentrum Juelich (FZJ) Germany | eServer Blue Gene Solution IBM | 2048 | 2005 | 4.71 | 5.73 |
| 61 | NCAR (National Center for Atmospheric Research) United States | eServer Blue Gene Solution IBM | 2048 | 2005 | 4.71 | 5.73 |
| 62 | NIWS Co, Ltd Japan | eServer Blue Gene Solution IBM | 2048 | 2005 | 4.71 | 5.73 |
| 63 | UCSD/San Diego Supercomputer Center United States | Intimidata - eServer Blue Gene Solution IBM | 2048 | 2005 | 4.71 | 5.73 |
| 64 | University of Edinburgh United Kingdom | eServer Blue Gene Solution IBM | 2048 | 2005 | 4.71 | 5.73 |
| 65 | KTH - Royal Institute of Technology Sweden | Lenngren - PowerEdge 1850, 3.2 GHz, Infiniband Dell | 886 | 2005 | 4.70 | 5.67 |
| 66 | University of Illinois United States | Turing - XServe G5 2GHz, Myrinet Self-made | 1024 | 2005 | 4.56 | 8.19 |
| 67 | Kyoto University Japan | PRIMEPOWER HPC2500 (1.56 GHz) Fujitsu | 1472 | 2004 | 4.55 | 9.19 |
| 68 | Pittsburgh Supercomputing Center United States | AlphaServer SC45, 1 GHz Hewlett-Packard | 3016 | 2001 | 4.46 | 6.03 |
| 69 | National Centers for Environmental Prediction United States | eServer pSeries 655 (1.7 GHz Power4+) IBM | 1152 | 2004 | 4.38 | 7.83 |
| 70 | National Centers for Environmental Prediction United States | eServer pSeries 655 (1.7 GHz Power4+) IBM | 1152 | 2004 | 4.38 | 7.83 |
| 71 | Caltech/JPL United States | Cosmos - PowerEdge 1750, P4 Xeon 3.2 GHz, Myrinet Dell | 1024 | 2004 | 4.30 | 6.55 |
| 72 | Chinese Academy of Science China | DeepComp 6800, Itanium2 1.3 GHz, QsNet lenovo | 1024 | 2003 | 4.19 | 5.32 |
| 73 | NCAR (National Center for Atmospheric Research) United States | pSeries 690 Turbo 1.3 GHz IBM | 1600 | 2003 | 4.18 | 8.32 |
| 74 | Texas Advanced Computing Center/Univ. of Texas United States | lonestar - PowerEdge 1750, Pentium4 Xeon 3.2/3.06 GHz, Myrinet Dell-Cray | 1024 | 2004 | 4.15 | 6.34 |
| 75 | DOE/Bettis Atomic Power Laboratory United States | Atipa Cluster, Opteron, Myrinet Atipa Technology | 1090 | 2005 | 4.04 | 5.23 |
| 76 | DOE/Knolls Atomic Power Laboratory United States | Atipa Cluster, Opteron, Myrinet Atipa Technology | 1090 | 2005 | 4.04 | 5.23 |
| 77 | Commissariat a l'Energie Atomique (CEA) France | AlphaServer SC45, 1 GHz Hewlett-Packard | 2560 | 2001 | 3.98 | 5.12 |
| 78 | Lawrence Livermore National Laboratory United States | eServer pSeries 655 (1.5 GHz Power4+) IBM | 1024 | 2004 | 3.81 | 6.14 |
| 79 | Lawrence Livermore National Laboratory United States | eServer pSeries 655 (1.5 GHz Power4+) IBM | 1024 | 2004 | 3.81 | 6.14 |
| 80 | Korea Meteorological Administration Korea, South | Cray X1E Cray Inc. | 252 | 2005 | 3.78 | 4.56 |
| 81 | US Army HPC Research Center at NCS United States | Cray X1E Cray Inc. | 252 | 2005 | 3.78 | 4.56 |
| 82 | Bank United Kingdom | BladeCenter HS20 Xeon 3.06 GHz, Gig-Ethernet IBM | 3200 | 2004 | 3.76 | 19.58 |
| 83 | Westgrid Canada | glacier - BladeCenter Xeon 3.06 GHz, Gig-Ethernet IBM | 1680 | 2005 | 3.76 | 10.28 |
| 84 | Petroleum Company (G) Saudia Arabia | BladeCenter HS20 Cluster, Xeon 3.2 GHz, GigEthernet IBM | 1536 | 2004 | 3.76 | 9.83 |
| 85 | Credit Suisse/First Boston United Kingdom | BladeCenter HS20 Xeon 3.06 GHz, Gig-Ethernet IBM | 1500 | 2004 | 3.76 | 9.18 |
| 86 | Animal Logic Australia | BladeCenter HS20 Xeon 3.06 GHz, Gig-Ethernet IBM | 1148 | 2005 | 3.76 | 7.03 |
| 87 | Geoscience (B) India | BladeCenter HS20 Cluster, Xeon EM64T 3.4 GHz - Gig-Ethernet IBM | 1024 | 2005 | 3.76 | 6.96 |
| 88 | Geoscience (C) United Kingdom | xSeries Xeon 3.06 GHz - Gig-E IBM | 1128 | 2004 | 3.76 | 6.90 |
| 89 | Geoscience (C) United Kingdom | xSeries Xeon 3.06 GHz - Gig-E IBM | 1128 | 2004 | 3.76 | 6.90 |
| 90 | Semiconductor Company (D) Israel | xSeries Xeon 3.06 GHz - Gig-E IBM | 1120 | 2004 | 3.76 | 6.85 |
| 91 | Financial Services (H) United States | BladeCenter HS20 Cluster, Xeon 3.2 GHz, GigEthernet IBM | 1024 | 2005 | 3.76 | 6.55 |
| 92 | Bank (H) Germany | BladeCenter Xeon 3.06 GHz, Gig-Ethernet IBM | 1064 | 2004 | 3.76 | 6.51 |
| 93 | ConocoPhillips United States | BladeCenter Xeon 3.06 GHz, Gig-Ethernet IBM | 1056 | 2004 | 3.76 | 6.46 |
| 94 | PGS United States | xSeries Cluster Xeon 3.06 GHz - Gig-E IBM | 1024 | 2003 | 3.76 | 6.27 |
| 95 | Petroleum Company (C) Brazil | xSeries Cluster Xeon 3.06 GHz - Gig-E IBM | 1024 | 2004 | 3.76 | 6.27 |
| 96 | IBM - Deep Computing Capacity on Demand Center United States | xSeries Xeon 3.06 GHz - Gig-E IBM | 1000 | 2004 | 3.76 | 6.12 |
| 97 | PETROBRAS Brazil | bwr1 - Cluster Platform 3000 DL140G3 Xeon 3.06 GHz GigEthernet Hewlett-Packard | 1300 | 2004 | 3.74 | 7.96 |
| 98 | Naval Oceanographic Office (NAVOCEANO) United States | pSeries 690 Turbo 1.3 GHz IBM | 1408 | 2004 | 3.72 | 7.32 |
| 99 | WETA Digital New Zealand | BladeCenter HS20 Cluster, Xeon EM64T 3.6 GHz - Gig-Ethernet IBM | 1000 | 2005 | 3.67 | 7.20 |
| 100 | Galactic Computing (Shenzhen) Ltd. China | Supercomputing Blade System GT4000 Galactic Computing | 562 | 2005 | 3.41 | 4.05 |