| Rank | Site | Computer | Processors | Year | Rmax | Rpeak | | 1 | DOE/NNSA/LLNL
United States | BlueGene/L - eServer Blue Gene Solution
IBM | 131072 | 2005 | 280600 | 367000 |
| 2 | IBM Thomas J. Watson Research Center
United States | BGW - eServer Blue Gene Solution
IBM | 40960 | 2005 | 91290 | 114688 |
| 3 | DOE/NNSA/LLNL
United States | ASC Purple - eServer pSeries p5 575 1.9 GHz
IBM | 10240 | 2005 | 63390 | 77824 |
| 4 | NASA/Ames Research Center/NAS
United States | Columbia - SGI Altix 1.5 GHz, Voltaire Infiniband
SGI | 10160 | 2004 | 51870 | 60960 |
| 5 | Sandia National Laboratories
United States | Thunderbird - PowerEdge 1850, 3.6 GHz, Infiniband
Dell | 8000 | 2005 | 38270 | 64512 |
| 6 | Sandia National Laboratories
United States | Red Storm Cray XT3, 2.0 GHz
Cray Inc. | 10880 | 2005 | 36190 | 43520 |
| 7 | The Earth Simulator Center
Japan | Earth-Simulator
NEC | 5120 | 2002 | 35860 | 40960 |
| 8 | Barcelona Supercomputer Center
Spain | MareNostrum - JS20 Cluster, PPC 970, 2.2 GHz, Myrinet
IBM | 4800 | 2005 | 27910 | 42144 |
| 9 | ASTRON/University Groningen
Netherlands | Stella - eServer Blue Gene Solution
IBM | 12288 | 2005 | 27450 | 34406.4 |
| 10 | Oak Ridge National Laboratory
United States | Jaguar - Cray XT3, 2.4 GHz
Cray Inc. | 5200 | 2005 | 20527 | 24960 |
| 11 | Lawrence Livermore National Laboratory
United States | Thunder - Intel Itanium2 Tiger4 1.4GHz - Quadrics
California Digital Corporation | 4096 | 2004 | 19940 | 22938 |
| 12 | Computational Biology Research Center, AIST
Japan | Blue Protein - eServer Blue Gene Solution
IBM | 8192 | 2005 | 18200 | 22937.6 |
| 13 | Ecole Polytechnique Federale de Lausanne
Switzerland | eServer Blue Gene Solution
IBM | 8192 | 2005 | 18200 | 22937.6 |
| 14 | ERDC MSRC
United States | Cray XT3, 2.6 GHz
Cray Inc. | 4096 | 2005 | 16975 | 21299 |
| 15 | COLSA
United States | MACH5 - Apple XServe, 2.0 GHz, Myrinet
Self-made | 3072 | 2005 | 16180 | 24576 |
| 16 | Korea Meteorological Administration
Korea, South | Cray X1E (4GB)
Cray Inc. | 1020 | 2005 | 15706 | 18442 |
| 17 | Oak Ridge National Laboratory
United States | Cray X1E (2GB)
Cray Inc. | 1014 | 2005 | 14955 | 18333 |
| 18 | Los Alamos National Laboratory
United States | ASCI Q - AlphaServer SC45, 1.25 GHz
Hewlett-Packard | 8192 | 2002 | 13880 | 20480 |
| 19 | Lawrence Livermore National Laboratory
United States | eServer pSeries p5 575 1.9 GHz
IBM | 2048 | 2005 | 13090 | 15564.8 |
| 20 | Virginia Tech
United States | System X - 1100 Dual 2.3 GHz Apple XServe/Mellanox Infiniband 4X/Cisco GigE
Self-made | 2200 | 2004 | 12250 | 20240 |
| 21 | Japan Atomic Energy Research Institute
Japan | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink
SGI | 2048 | 2005 | 11814 | 13107 |
| 22 | IBM - Rochester
United States | BlueGene/L DD1 Prototype (0.5GHz PowerPC 440 w/Custom)
IBM/ LLNL | 8192 | 2004 | 11680 | 16384 |
| 23 | Wright-Patterson Air Force Base/DoD ASC
United States | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink
SGI | 2048 | 2003 | 11652 | 13107 |
| 24 | University of Southern California
United States | HPC - Pentium4 Xeon, EM64T, Opteron, Opteron dual core, Cluster, Myrinet
IBM, Sun, Myricom | 2904 | 2005 | 10750 | 17280 |
| 25 | US Army Research Laboratory (ARL)
United States | John Von Neumann - LNX Cluster, Xeon 3.6 GHz, Myrinet
Linux Networx | 2048 | 2005 | 10650 | 14745.6 |
| 26 | China Meteorological Administration
China | eServer pSeries 655 (1.7 GHz Power4+)
IBM | 3200 | 2005 | 10310 | 21760 |
| 27 | Naval Oceanographic Office (NAVOCEANO)
United States | eServer pSeries 655 (1.7 GHz Power4+)
IBM | 2944 | 2004 | 10310 | 20019.2 |
| 28 | NCSA
United States | Tungsten - PowerEdge 1750, P4 Xeon 3.06 GHz, Myrinet
Dell | 2500 | 2003 | 9819 | 15300 |
| 29 | IBM - Almaden Research Center
United States | eServer Blue Gene Solution
IBM | 4096 | 2005 | 9360 | 11468.8 |
| 30 | IBM - Deep Computing Capacity on Demand Center
United States | eServer Blue Gene Solution
IBM | 4096 | 2005 | 9360 | 11468.8 |
| 31 | IBM Research
Switzerland | eServer Blue Gene Solution
IBM | 4096 | 2005 | 9360 | 11468.8 |
| 32 | IBM Thomas J. Watson Research Center
United States | eServer Blue Gene Solution
IBM/ LLNL | 4096 | 2005 | 9360 | 11468.8 |
| 33 | ECMWF
United Kingdom | eServer pSeries 690 (1.9 GHz Power4+)
IBM | 2176 | 2004 | 9241 | 16538 |
| 34 | ECMWF
United Kingdom | eServer pSeries 690 (1.9 GHz Power4+)
IBM | 2176 | 2004 | 9241 | 16538 |
| 35 | UCSD/San Diego Supercomputer Center
United States | DataStar - eServer pSeries 655/690 (1.5/1.7 GHz Power4+)
IBM | 2464 | 2005 | 9121 | 15628 |
| 36 | Australian Partnership for Advanced Computing (APAC)
Australia | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink
SGI | 1536 | 2005 | 8974 | 9830 |
| 37 | HWW/Universitaet Stuttgart
Germany | SX8/576M72
NEC | 576 | 2005 | 8923 | 9216 |
| 38 | Hitachi Ltd. Enterprise Server Division
Japan | SR11000-K1/80
Hitachi | 80 | 2005 | 8893 | 10752 |
| 39 | Institute of Physical and Chemical Res. (RIKEN)
Japan | RIKEN Super Combined Cluster
Fujitsu | 2048 | 2004 | 8728 | 12534 |
| 40 | Pacific Northwest National Laboratory
United States | Mpp2 - Cluster Platform 6000 rx2600 Itanium2 1.5 GHz, Quadrics
Hewlett-Packard | 1936 | 2003 | 8633 | 11616 |
| 41 | Caltech
United States | CITerra - PowerEdge 1850, 3.2 GHz, Myrinet
Dell | 2048 | 2005 | 8408 | 13107.2 |
| 42 | Shanghai Supercomputer Center
China | Dawning 4000A, Opteron 2.2 GHz, Myrinet
Dawning | 2560 | 2004 | 8061 | 11264 |
| 43 | Los Alamos National Laboratory
United States | Lightning - Opteron 2 GHz, Myrinet
Linux Networx | 2816 | 2003 | 8051 | 11264 |
| 44 | Pittsburgh Supercomputing Center
United States | Cray XT3, 2.4 GHz
Cray Inc. | 2060 | 2005 | 7935.82 | 9888 |
| 45 | Lawrence Livermore National Laboratory
United States | MCR Linux Cluster Xeon 2.4 GHz - Quadrics
Linux Networx/Quadrics | 2304 | 2002 | 7634 | 11060 |
| 46 | HPCx
United Kingdom | eServer pSeries p5 575 1.5 GHz
IBM | 1536 | 2005 | 7395 | 9216 |
| 47 | Lawrence Livermore National Laboratory
United States | ASCI White, SP Power3 375 MHz
IBM | 8192 | 2000 | 7304 | 12288 |
| 48 | NERSC/LBNL
United States | Seaborg - SP Power3 375 MHz 16 way
IBM | 6656 | 2002 | 7304 | 9984 |
| 49 | NCSA
United States | TeraGrid, Itanium2 1.3/1.5 GHZ, Myrinet
IBM | 1776 | 2004 | 7215 | 10259 |
| 50 | US Army Research Laboratory (ARL)
United States | eServer Opteron 2.2 GHz. Myrinet
IBM | 2320 | 2004 | 7185 | 10208 |
| 51 | University of Sherbrooke
Canada | Mp - PowerEdge SC1425 3.6 GHz- Infiniband
Dell | 1152 | 2005 | 6888 | 8294.4 |
| 52 | Nagoya University
Japan | PRIMEPOWER HPC2500 (2.08 GHz)
Fujitsu | 1664 | 2005 | 6860 | 13844 |
| 53 | Lawrence Livermore National Laboratory
United States | xSeries Cluster Xeon 2.4 GHz - Quadrics
IBM/Quadrics | 1920 | 2003 | 6586 | 9216 |
| 54 | NERSC/LBNL
United States | eServer pSeries p5 575 1.9 GHz
IBM | 976 | 2005 | 6415.13 | 7417.6 |
| 55 | NASA/Goddard Space Flight Center
United States | Explore - SGI Altix 3700 Bx2, 1.5 GHz, NUMAlink, Infiniband
SGI | 1152 | 2005 | 6309.1 | 6912 |
| 56 | Lawrence Livermore National Laboratory
United States | Lilac - xSeries x335 Cluster, Xeon 3.06 GHz, Quadrics
IBM | 1540 | 2004 | 6232 | 9425 |
| 57 | HPCx
United Kingdom | eServer pSeries 690 (1.7 GHz Power4+)
IBM | 1600 | 2004 | 6188 | 10880 |
| 58 | Grid Technology Research Center, AIST
Japan | AIST Super Cluster P-32 - AIST Super Cluster P-32, Opteron 2.0 GHz, Myrinet
IBM | 2200 | 2004 | 6155 | 8800 |
| 59 | NCSA
United States | Tungsten 2 - PowerEdge 1850, 3.6 GHz, Infiniband
Dell | 1024 | 2005 | 6118 | 7373 |
| 60 | NCSA
United States | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink
SGI | 1024 | 2005 | 6117.27 | 6553 |
| 61 | Wright-Patterson Air Force Base/DoD ASC
United States | Cluster Platform 4000 DL145 Opteron 2.6 GHz Infiniband
Hewlett-Packard | 2048 | 2005 | 5904 | 10649.6 |
| 62 | Commissariat a l'Energie Atomique (CEA)
France | Tera10 beta system - NovaScale 5160, Itanium2 1.6 GHz, Quadrics
Bull SA | 1008 | 2005 | 5829 | 6451.2 |
| 63 | Lawrence Livermore National Laboratory
United States | eServer pSeries p5 575 1.9 GHz
IBM | 864 | 2005 | 5735 | 6566.4 |
| 64 | Seoul National University
Korea, South | eServer BladeCenter JS20 (PowerPC970 2.2 GHz), Myrinet
IBM | 968 | 2005 | 5618.3 | 8518.4 |
| 65 | Forschungszentrum Juelich (FZJ)
Germany | JUMP - eServer pSeries 690 (1.7 GHz Power4+)
IBM | 1312 | 2004 | 5568 | 8921 |
| 66 | Brigham Young University
United States | Marylou4 - PowerEdge 1855, 3.6 GHz, GigEthernet
Dell | 1260 | 2005 | 5439 | 9072 |
| 67 | University of Oklahoma
United States | Topdawg - PowerEdge 1850, 3.2 GHz, Infiniband
Dell | 1024 | 2005 | 5438 | 6553.6 |
| 68 | National Aerospace Laboratory of Japan
Japan | PRIMEPOWER HPC2500 (1.3 GHz)
Fujitsu | 2304 | 2002 | 5406 | 11980 |
| 69 | Joint Supercomputer Center
Russia | MVS-15000BM, eServer BladeCenter JS20 (PowerPC970 2.2 GHz), Myrinet
IBM | 924 | 2005 | 5355 | 8131.2 |
| 70 | KTH - Royal Institute of Technology
Sweden | Lenngren - PowerEdge 1850, 3.4 GHz, Infiniband
Dell | 886 | 2005 | 4999 | 6025 |
| 71 | Swiss Scientific Computing Center (CSCS)
Switzerland | Cray XT3, 2.6 GHz
Cray Inc. | 1100 | 2005 | 4782 | 5720 |
| 72 | Adam Opel AG
Germany | eServer pSeries p5 575 1.9 GHz
IBM | 720 | 2005 | 4776.5 | 5472 |
| 73 | Argonne National Laboratory
United States | eServer Blue Gene Solution
IBM | 2048 | 2005 | 4713 | 5734 |
| 74 | Boston University
United States | eServer Blue Gene Solution
IBM | 2048 | 2005 | 4713 | 5734 |
| 75 | Forschungszentrum Juelich (FZJ)
Germany | eServer Blue Gene Solution
IBM | 2048 | 2005 | 4713 | 5734 |
| 76 | MIT
United States | eServer Blue Gene Solution
IBM | 2048 | 2005 | 4713 | 5734 |
| 77 | NCAR (National Center for Atmospheric Research)
United States | eServer Blue Gene Solution
IBM | 2048 | 2005 | 4713 | 5734 |
| 78 | NIWS Co, Ltd
Japan | eServer Blue Gene Solution
IBM | 2048 | 2005 | 4713 | 5734 |
| 79 | Princeton University
United States | Orangena - eServer Blue Gene Solution
IBM | 2048 | 2005 | 4713 | 5734 |
| 80 | UCSD/San Diego Supercomputer Center
United States | Intimidata - eServer Blue Gene Solution
IBM | 2048 | 2005 | 4713 | 5734 |
| 81 | University of Edinburgh
United Kingdom | eServer Blue Gene Solution
IBM | 2048 | 2005 | 4713 | 5734 |
| 82 | Government Classified
United States | Cluster Platform 3000 DL360G4 Xeon 3.4 GHz, Myrinet
Hewlett-Packard | 1000 | 2005 | 4624 | 6800 |
| 83 | Government Classified
United States | Cluster Platform 3000 DL360G4 Xeon 3.4 GHz, Myrinet
Hewlett-Packard | 1000 | 2005 | 4624 | 6800 |
| 84 | Max-Planck-Gesellschaft MPI/IPP
Germany | eServer pSeries p5 575 1.9 GHz
IBM | 688 | 2005 | 4563.5 | 5228.8 |
| 85 | University of Illinois
United States | Turing - XServe G5 2GHz, Myrinet
Self-made | 1024 | 2005 | 4559 | 8192 |
| 86 | Kyoto University
Japan | PRIMEPOWER HPC2500 (1.56 GHz)
Fujitsu | 1472 | 2004 | 4552 | 9185 |
| 87 | Pittsburgh Supercomputing Center
United States | AlphaServer SC45, 1 GHz
Hewlett-Packard | 3016 | 2001 | 4463 | 6032 |
| 88 | National Centers for Environmental Prediction
United States | eServer pSeries 655 (1.7 GHz Power4+)
IBM | 1152 | 2004 | 4379 | 7833.6 |
| 89 | National Centers for Environmental Prediction
United States | eServer pSeries 655 (1.7 GHz Power4+)
IBM | 1152 | 2004 | 4379 | 7833.6 |
| 90 | UT SimCenter at Chattanooga
United States | Slide Rule - PowerEdge 1850/1855 3.2 GHz GigEthernet
Dell | 1010 | 2005 | 4335 | 6464 |
| 91 | Total SA
France | Houat - eServer pSeries p5 575 1.5 GHz, Myrinet
IBM | 1024 | 2005 | 4307 | 6144 |
| 92 | Caltech/JPL
United States | Cosmos - PowerEdge 1750, P4 Xeon 3.2 GHz, Myrinet
Dell | 1024 | 2004 | 4298 | 6553.6 |
| 93 | Chinese Academy of Science
China | DeepComp 6800, Itanium2 1.3 GHz, QsNet
lenovo | 1024 | 2003 | 4193 | 5324.8 |
| 94 | NCAR (National Center for Atmospheric Research)
United States | pSeries 690 Turbo 1.3 GHz
IBM | 1600 | 2003 | 4184 | 8320 |
| 95 | Texas Advanced Computing Center/Univ. of Texas
United States | lonestar - PowerEdge 1750, Pentium4 Xeon 3.2/3.06 GHz, Myrinet
Dell-Cray | 1024 | 2004 | 4152 | 6338 |
| 96 | Walt Disney Feature Animation
United States | The Hive - Cluster Platform 3000 DL360G3 Xeon 3.06 GHz, Verari BladeRack 3.4 GHz, GigEthernet
Hewlett-Packard | 1110 | 2005 | 4131 | 6936 |
| 97 | DOE/Bettis Atomic Power Laboratory
United States | Atipa Cluster, Opteron, Myrinet
Atipa Technology | 1090 | 2005 | 4035 | 5232 |
| 98 | DOE/Knolls Atomic Power Laboratory
United States | Atipa Cluster, Opteron, Myrinet
Atipa Technology | 1090 | 2005 | 4035 | 5232 |
| 99 | NCAR (National Center for Atmospheric Research)
United States | eServer pSeries p5 575 1.9 GHz
IBM | 608 | 2005 | 4031 | 4620.8 |
| 100 | Commissariat a l'Energie Atomique (CEA)
France | AlphaServer SC45, 1 GHz
Hewlett-Packard | 2560 | 2001 | 3980 | 5120 |
