| 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 | 12208 | 2006 | 75760 | 92781 |
| 4 | NASA/Ames Research Center/NAS
United States | Columbia - SGI Altix 1.5 GHz, Voltaire Infiniband
SGI | 10160 | 2004 | 51870 | 60960 |
| 5 | Commissariat a l'Energie Atomique (CEA)
France | Tera-10 - NovaScale 5160, Itanium2 1.6 GHz, Quadrics
Bull SA | 8704 | 2006 | 42900 | 55705.6 |
| 6 | Sandia National Laboratories
United States | Thunderbird - PowerEdge 1850, 3.6 GHz, Infiniband
Dell | 9024 | 2006 | 38270 | 64972.8 |
| 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 | 38180 | 49868.8 |
| 8 | Forschungszentrum Juelich (FZJ)
Germany | JUBL - eServer Blue Gene Solution
IBM | 16384 | 2006 | 37330 | 45875 |
| 9 | Sandia National Laboratories
United States | Red Storm Cray XT3, 2.0 GHz
Cray Inc. | 10880 | 2005 | 36190 | 43520 |
| 10 | The Earth Simulator Center
Japan | Earth-Simulator
NEC | 5120 | 2002 | 35860 | 40960 |
| 11 | Barcelona Supercomputer Center
Spain | MareNostrum - JS20 Cluster, PPC 970, 2.2 GHz, Myrinet
IBM | 4800 | 2005 | 27910 | 42144 |
| 12 | ASTRON/University Groningen
Netherlands | Stella - eServer Blue Gene Solution
IBM | 12288 | 2005 | 27450 | 34406.4 |
| 13 | Oak Ridge National Laboratory
United States | Jaguar - Cray XT3, 2.4 GHz
Cray Inc. | 5200 | 2005 | 20527 | 24960 |
| 14 | Lawrence Livermore National Laboratory
United States | Thunder - Intel Itanium2 Tiger4 1.4GHz - Quadrics
California Digital Corporation | 4096 | 2004 | 19940 | 22938 |
| 15 | Computational Biology Research Center, AIST
Japan | Blue Protein - eServer Blue Gene Solution
IBM | 8192 | 2005 | 18200 | 22937.6 |
| 16 | Ecole Polytechnique Federale de Lausanne
Switzerland | eServer Blue Gene Solution
IBM | 8192 | 2005 | 18200 | 22937.6 |
| 17 | High Energy Accelerator Research Organization /KEK
Japan | KEK/BG Sakura - eServer Blue Gene Solution
IBM | 8192 | 2006 | 18200 | 22937.6 |
| 18 | High Energy Accelerator Research Organization /KEK
Japan | KEK/BG MOMO - eServer Blue Gene Solution
IBM | 8192 | 2006 | 18200 | 22937.6 |
| 19 | IBM Rochester, On Demand Deep Computing Center
United States | eServer Blue Gene Solution
IBM | 8192 | 2006 | 18200 | 22937.6 |
| 20 | ERDC MSRC
United States | Cray XT3, 2.6 GHz
Cray Inc. | 4096 | 2005 | 16975 | 21299 |
| 21 | COLSA
United States | MACH5 - Apple XServe, 2.0 GHz, Myrinet
Self-made | 3072 | 2005 | 16180 | 24576 |
| 22 | Korea Meteorological Administration
Korea, South | Cray X1E (4GB)
Cray Inc. | 1020 | 2005 | 15706 | 18442 |
| 23 | Indiana University
United States | Big Red - BladeCenter JS21 Cluster, PPC 970, 2.5 GHz, Myrinet
IBM | 2048 | 2006 | 15040 | 20480 |
| 24 | Oak Ridge National Laboratory
United States | Cray X1E (2GB)
Cray Inc. | 1014 | 2005 | 14955 | 18333 |
| 25 | Los Alamos National Laboratory
United States | ASCI Q - AlphaServer SC45, 1.25 GHz
Hewlett-Packard | 8192 | 2002 | 13880 | 20480 |
| 26 | University of Southern California
United States | HPC - Pentium4 Xeon, EM64T, Opteron, Opteron dual core, Cluster, Myrinet
Sun Microsystems | 5328 | 2006 | 13810 | 21312 |
| 27 | Geoscience (E)
United States | BladeCenter LS20, Opteron 2.2 GHz Dual core, GigEthernet
IBM | 5000 | 2005 | 12312 | 22000 |
| 28 | Virginia Tech
United States | System X - 1100 Dual 2.3 GHz Apple XServe/Mellanox Infiniband 4X/Cisco GigE
Self-made | 2200 | 2004 | 12250 | 20240 |
| 29 | Japan Atomic Energy Research Institute
Japan | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink
SGI | 2048 | 2005 | 11814 | 13107 |
| 30 | Atomic Weapons Establishment
United Kingdom | Cray XT3, 2.6 GHz
Cray Inc. | 2652 | 2006 | 11810 | 13790.4 |
| 31 | IBM - Rochester
United States | BlueGene/L DD1 Prototype (0.5GHz PowerPC 440 w/Custom)
IBM | 8192 | 2004 | 11680 | 16384 |
| 32 | Wright-Patterson Air Force Base/DoD ASC
United States | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink
SGI | 2048 | 2003 | 11652 | 13107 |
| 33 | US Army Research Laboratory (ARL)
United States | John Von Neumann - LNX Cluster, Xeon 3.6 GHz, Myrinet
Linux Networx | 2048 | 2005 | 10650 | 14745.6 |
| 34 | Center for Computational Science, University of Tsukuba
Japan | PACS-CS, low voltage Xeon 2.8 GHz, 3D Hyper-Crossbar
Hitachi/Fujitsu | 2560 | 2006 | 10350 | 14336 |
| 35 | China Meteorological Administration
China | eServer pSeries 655 (1.7 GHz Power4+)
IBM | 3200 | 2005 | 10310 | 21760 |
| 36 | Naval Oceanographic Office (NAVOCEANO)
United States | eServer pSeries 655 (1.7 GHz Power4+)
IBM | 2944 | 2004 | 10310 | 20019.2 |
| 37 | NCSA
United States | Tungsten - PowerEdge 1750, P4 Xeon 3.06 GHz, Myrinet
Dell | 2500 | 2003 | 9819 | 15300 |
| 38 | High Energy Accelerator Research Organization /KEK
Japan | KEK/BG UME - eServer Blue Gene Solution
IBM | 4096 | 2006 | 9360 | 11468.8 |
| 39 | IBM - Almaden Research Center
United States | eServer Blue Gene Solution
IBM | 4096 | 2005 | 9360 | 11468.8 |
| 40 | IBM Research
Switzerland | eServer Blue Gene Solution
IBM | 4096 | 2005 | 9360 | 11468.8 |
| 41 | IBM Thomas J. Watson Research Center
United States | eServer Blue Gene Solution
IBM | 4096 | 2005 | 9360 | 11468.8 |
| 42 | ECMWF
United Kingdom | eServer pSeries 690 (1.9 GHz Power4+)
IBM | 2176 | 2004 | 9241 | 16538 |
| 43 | ECMWF
United Kingdom | eServer pSeries 690 (1.9 GHz Power4+)
IBM | 2176 | 2004 | 9241 | 16538 |
| 44 | UCSD/San Diego Supercomputer Center
United States | DataStar - eServer pSeries 655/690 (1.5/1.7 GHz Power4+)
IBM | 2464 | 2005 | 9121 | 15628 |
| 45 | Japan Meteorological Agency
Japan | SR11000-K1/80
Hitachi | 80 | 2005 | 9036 | 10752 |
| 46 | Japan Meteorological Agency
Japan | SR11000-K1/80
Hitachi | 80 | 2005 | 9036 | 10752 |
| 47 | Australian Partnership for Advanced Computing (APAC)
Australia | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink
SGI | 1536 | 2005 | 8974 | 9830 |
| 48 | HWW/Universitaet Stuttgart
Germany | SX8/576M72
NEC | 576 | 2005 | 8923 | 9216 |
| 49 | Institute of Physical and Chemical Res. (RIKEN)
Japan | RIKEN Super Combined Cluster
Fujitsu | 2048 | 2004 | 8728 | 12534 |
| 50 | Pacific Northwest National Laboratory
United States | Mpp2 - Cluster Platform 6000 rx2600 Itanium2 1.5 GHz, Quadrics
Hewlett-Packard | 1936 | 2003 | 8633 | 11616 |
| 51 | Georgia Institute of Technology
United States | BladeCenter LS20, Opteron 2.0 GHz Dual core, GigEthernet
IBM | 3920 | 2006 | 8509 | 15680 |
| 52 | Caltech
United States | CITerra - PowerEdge 1850, 3.2 GHz, Myrinet
Dell | 2048 | 2005 | 8408 | 13107.2 |
| 53 | Shanghai Supercomputer Center
China | Dawning 4000A, Opteron 2.2 GHz, Myrinet
Dawning | 2560 | 2004 | 8061 | 11264 |
| 54 | Los Alamos National Laboratory
United States | Lightning - Opteron 2 GHz, Myrinet
Linux Networx | 2816 | 2003 | 8051 | 11264 |
| 55 | Pittsburgh Supercomputing Center
United States | Cray XT3, 2.4 GHz
Cray Inc. | 2060 | 2005 | 7935.82 | 9888 |
| 56 | Wright-Patterson Air Force Base/DoD ASC
United States | Cluster Platform 4000 DL145 Opteron 2.8 GHz Infiniband
Hewlett-Packard | 2048 | 2006 | 7925 | 11469 |
| 57 | University at Buffalo, SUNY, Center for Computational Res.
United States | U2 - PowerEdge SC1425 3.2 GHz, Myrinet
Dell | 1536 | 2006 | 7737 | 9830.4 |
| 58 | Lawrence Livermore National Laboratory
United States | MCR Linux Cluster Xeon 2.4 GHz - Quadrics
Linux Networx | 2304 | 2002 | 7634 | 11060 |
| 59 | HPCx
United Kingdom | eServer pSeries p5 575 1.5 GHz
IBM | 1536 | 2005 | 7395 | 9216 |
| 60 | Lawrence Livermore National Laboratory
United States | ASCI White, SP Power3 375 MHz
IBM | 8192 | 2000 | 7304 | 12288 |
| 61 | NERSC/LBNL
United States | Seaborg - SP Power3 375 MHz 16 way
IBM | 6656 | 2002 | 7304 | 9984 |
| 62 | NCSA
United States | TeraGrid, Itanium2 1.3/1.5 GHZ, Myrinet
IBM | 1776 | 2004 | 7215 | 10259 |
| 63 | US Army Research Laboratory (ARL)
United States | eServer Opteron 2.2 GHz. Myrinet
IBM | 2320 | 2004 | 7185 | 10208 |
| 64 | Swiss Scientific Computing Center (CSCS)
Switzerland | Cray XT3, 2.6 GHz
Cray Inc. | 1664 | 2006 | 7050 | 8652.8 |
| 65 | Texas Advanced Computing Center/Univ. of Texas
United States | Lonestar2 - PowerEdge 1855, 3.2 GHz, Infiniband
Dell | 1300 | 2006 | 6989 | 8320 |
| 66 | University of Sherbrooke
Canada | Mp - PowerEdge SC1425 3.6 GHz- Infiniband
Dell | 1152 | 2005 | 6888 | 8294.4 |
| 67 | Nagoya University
Japan | PRIMEPOWER HPC2500 (2.08 GHz)
Fujitsu | 1664 | 2005 | 6860 | 13844 |
| 68 | Intel
United States | Endeavor - Intel Cluster, Xeon 3.0 GHz dual core, Infiniband
Intel | 928 | 2006 | 6855 | 11136 |
| 69 | Los Alamos National Laboratory
United States | Coyote A - Opteron 2.6 GHz, Infiniband
Linux Networx | 1620 | 2005 | 6677 | 8424 |
| 70 | Joint Supercomputer Center
Russia | MVS-15000BM, eServer BladeCenter JS20 (PowerPC970 2.2 GHz), Myrinet
IBM | 1148 | 2006 | 6645.53 | 10102.4 |
| 71 | Lawrence Livermore National Laboratory
United States | xSeries Cluster Xeon 2.4 GHz - Quadrics
IBM | 1920 | 2003 | 6586 | 9216 |
| 72 | NERSC/LBNL
United States | eServer pSeries p5 575 1.9 GHz
IBM | 976 | 2005 | 6415.13 | 7417.6 |
| 73 | NASA/Goddard Space Flight Center
United States | Explore - SGI Altix 3700 Bx2, 1.5 GHz, NUMAlink, Infiniband
SGI | 1152 | 2005 | 6309.1 | 6912 |
| 74 | University of North Carolina
United States | Topsail - PowerEdge 1855, 3.6 GHz, Infiniband
Dell | 1040 | 2006 | 6252 | 7488 |
| 75 | Lawrence Livermore National Laboratory
United States | Lilac - xSeries x335 Cluster, Xeon 3.06 GHz, Quadrics
IBM | 1540 | 2004 | 6232 | 9425 |
| 76 | HPCx
United Kingdom | eServer pSeries 690 (1.7 GHz Power4+)
IBM | 1600 | 2004 | 6188 | 10880 |
| 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 | 6155 | 8800 |
| 78 | NCSA
United States | Tungsten 2 - PowerEdge 1850, 3.6 GHz, Infiniband
Dell | 1024 | 2005 | 6118 | 7373 |
| 79 | NCSA
United States | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink
SGI | 1024 | 2005 | 6117.27 | 6553 |
| 80 | SharcNet
Canada | Whale - Cluster Platform 4000 DL145 Opteron 2.2 GHz Dual Core GigEthernet
Hewlett-Packard | 3072 | 2006 | 6015 | 13516.8 |
| 81 | Tohoku University, Institute of Fluid Science
Japan | SGI Altix 3700 Bx2, 1.6 GHz, NUMALink, 10GigEthernet
SGI | 1024 | 2006 | 6007.05 | 6553 |
| 82 | Telecommunication Company
United States | Blade Cluster BL-20P, Pentium4 Xeon 3.2 GHz, GigEthernet
Hewlett-Packard | 1728 | 2006 | 5972 | 11059.2 |
| 83 | SharcNet
Canada | Requin - Cluster Platform 4000 DL145, Opteron 2,6 GHz, Quadrics
Hewlett-Packard | 1536 | 2006 | 5746 | 7987.2 |
| 84 | Lawrence Livermore National Laboratory
United States | eServer pSeries p5 575 1.9 GHz
IBM | 864 | 2005 | 5735 | 6566.4 |
| 85 | Seoul National University
Korea, South | eServer BladeCenter JS20 (PowerPC970 2.2 GHz), Myrinet
IBM | 968 | 2005 | 5618.3 | 8518.4 |
| 86 | Forschungszentrum Juelich (FZJ)
Germany | JUMP - eServer pSeries 690 (1.7 GHz Power4+)
IBM | 1312 | 2004 | 5568 | 8921 |
| 87 | Brigham Young University
United States | Marylou4 - PowerEdge 1855, 3.6 GHz, GigEthernet
Dell | 1260 | 2005 | 5439 | 9072 |
| 88 | University of Oklahoma
United States | Topdawg - PowerEdge 1850, 3.2 GHz, Infiniband
Dell | 1024 | 2005 | 5438 | 6553.6 |
| 89 | National Aerospace Laboratory of Japan
Japan | PRIMEPOWER HPC2500 (1.3 GHz)
Fujitsu | 2304 | 2002 | 5406 | 11980 |
| 90 | Sun
United States | SSC_V40z+x4100 - Fire V40x/X4100 Cluster Opteron 2.4GHz dual core, Infiniband
Sun Microsystems | 1536 | 2006 | 5404 | 7372.8 |
| 91 | KTH - Royal Institute of Technology
Sweden | Lenngren - PowerEdge 1850, 3.4 GHz, Infiniband
Dell | 886 | 2005 | 4999 | 6025 |
| 92 | Japan Meteorological Agency
Japan | SR11000-J1/50
Hitachi | 50 | 2005 | 4993 | 6080 |
| 93 | Financial Services (M)
United Kingdom | BladeCenter LS20, Opteron 2.2 GHz Dual core, GigEthernet
IBM | 2000 | 2006 | 4924.8 | 8800 |
| 94 | Financial Services (M)
United Kingdom | BladeCenter LS20, Opteron 2.2 GHz Dual core, GigEthernet
IBM | 2000 | 2006 | 4924.8 | 8800 |
| 95 | Adam Opel AG
Germany | eServer pSeries p5 575 1.9 GHz
IBM | 720 | 2005 | 4776.5 | 5472 |
| 96 | Los Alamos National Laboratory
United States | Coyote B - Opteron 2.6 GHz, Infiniband
Linux Networx | 1080 | 2005 | 4720.65 | 5616 |
| 97 | Argonne National Laboratory
United States | eServer Blue Gene Solution
IBM | 2048 | 2005 | 4713 | 5734 |
| 98 | Boston University
United States | eServer Blue Gene Solution
IBM | 2048 | 2005 | 4713 | 5734 |
| 99 | Iowa State University
United States | CyBlue - eServer Blue Gene Solution
IBM | 2048 | 2006 | 4713 | 5734 |
| 100 | MIT
United States | eServer Blue Gene Solution
IBM | 2048 | 2005 | 4713 | 5734 |
