| Rank | Site | Computer | Cores | Year | Rmax | Rpeak | | 1 | The Earth Simulator Center Japan | Earth-Simulator NEC | 5120 | 2002 | 35860 | 40960 |
| 2 | Los Alamos National Laboratory United States | ASCI Q - AlphaServer SC45, 1.25 GHz Hewlett-Packard | 8192 | 2002 | 13880 | 20480 |
| 3 | Lawrence Livermore National Laboratory United States | MCR Linux Cluster Xeon 2.4 GHz - Quadrics Linux Networx/Quadrics | 2304 | 2002 | 7634 | 11060 |
| 4 | Lawrence Livermore National Laboratory United States | ASCI White, SP Power3 375 MHz IBM | 8192 | 2000 | 7304 | 12288 |
| 5 | NERSC/LBNL United States | Seaborg - SP Power3 375 MHz 16 way IBM | 6656 | 2002 | 7304 | 9984 |
| 6 | Lawrence Livermore National Laboratory United States | xSeries Cluster Xeon 2.4 GHz - Quadrics IBM/Quadrics | 1920 | 2003 | 6586 | 9216 |
| 7 | National Aerospace Laboratory of Japan Japan | PRIMEPOWER HPC2500 (1.3 GHz) Fujitsu | 2304 | 2002 | 5406 | 11980 |
| 8 | Pacific Northwest National Laboratory United States | Cluster Platform 6000 rx2600 Itanium2 1 GHz Cluster - Quadrics Hewlett-Packard | 1540 | 2003 | 4881 | 6160 |
| 9 | Pittsburgh Supercomputing Center United States | AlphaServer SC45, 1 GHz Hewlett-Packard | 3016 | 2001 | 4463 | 6032 |
| 10 | Commissariat a l'Energie Atomique (CEA) France | AlphaServer SC45, 1 GHz Hewlett-Packard | 2560 | 2001 | 3980 | 5120 |
| 11 | Forecast Systems Laboratory - NOAA United States | Aspen Systems, Dual Xeon 2.2 GHz - Myrinet2000 HPTi | 1536 | 2002 | 3337 | 6758 |
| 12 | HPCx United Kingdom | pSeries 690 Turbo 1.3GHz IBM | 1280 | 2002 | 3241 | 6656 |
| 13 | NCAR (National Center for Atmospheric Research) United States | pSeries 690 Turbo 1.3GHz IBM | 1216 | 2002 | 3164 | 6323 |
| 14 | Naval Oceanographic Office (NAVOCEANO) United States | pSeries 690 Turbo 1.3GHz IBM | 1184 | 2002 | 3160 | 6156.8 |
| 15 | ECMWF United Kingdom | pSeries 690 Turbo 1.3GHz IBM | 960 | 2002 | 2560 | 4992 |
| 16 | ECMWF United Kingdom | pSeries 690 Turbo 1.3GHz IBM | 960 | 2002 | 2560 | 4992 |
| 17 | Sandia National Laboratories United States | ASCI Red Intel | 9632 | 1999 | 2379 | 3207 |
| 18 | Oak Ridge National Laboratory United States | pSeries 690 Turbo 1.3GHz IBM | 864 | 2002 | 2310 | 4492.8 |
| 19 | Louisiana State University United States | SuperMike - P4 Xeon 1.8 GHz - Myrinet Atipa Technology | 1024 | 2002 | 2207 | 3686.4 |
| 20 | NASA/Goddard Space Flight Center United States | AlphaServer SC45, 1 GHz Hewlett-Packard | 1392 | 2002 | 2164 | 2784 |
| 21 | Lawrence Livermore National Laboratory United States | ASCI Blue-Pacific SST, IBM SP 604e IBM | 5808 | 1999 | 2144 | 3856.5 |
| 22 | US Army Research Laboratory (ARL) United States | pSeries 690 Turbo 1.3GHz IBM | 800 | 2002 | 2140 | 4160 |
| 23 | Atomic Weapons Establishment United Kingdom | SP Power3 375 MHz 16 way IBM | 1920 | 2002 | 2106 | 2880 |
| 24 | Max-Planck-Gesellschaft MPI/IPP Germany | pSeries 690 Turbo 1.3GHz IBM | 768 | 2002 | 2050 | 3993.6 |
| 25 | University at Buffalo, SUNY, Center for Computational Res. United States | Joplin - PowerEdge 2650 Cluster P4 Xeon 2.4 GHz - Myrinet Dell | 600 | 2002 | 2004 | 2880 |
| 26 | National Centers for Environmental Prediction United States | pSeries 690 Turbo 1.3GHz IBM | 704 | 2002 | 1849 | 3660.8 |
| 27 | National Centers for Environmental Prediction United States | pSeries 690 Turbo 1.3GHz IBM | 704 | 2002 | 1849 | 3660.8 |
| 28 | University of Tokyo Japan | SR8000/MPP Hitachi | 1152 | 2001 | 1709.1 | 2074 |
| 29 | Leibniz Rechenzentrum Germany | SR8000-F1/168 Hitachi | 168 | 2002 | 1653 | 2016 |
| 30 | Los Alamos National Laboratory United States | ASCI Blue Mountain SGI | 6144 | 1998 | 1608 | 3072 |
| 31 | NCSA United States | TeraGrid Cluster Itanium 2 1 GHz - Myrinet IBM | 512 | 2003 | 1593 | 2048 |
| 32 | Sandia National Laboratories United States | Vplant Cluster P4 XEON 2.4/2.0 GHz - Myrinet Dell | 660 | 2002 | 1504 | 2963 |
| 33 | DKRZ - Deutsches Klimarechenzentrum Germany | SX-6/192M24 NEC | 192 | 2003 | 1484 | 1536 |
| 34 | Naval Oceanographic Office (NAVOCEANO) United States | SP Power3 375 MHz IBM | 1336 | 2000 | 1417 | 2004 |
| 35 | Deutscher Wetterdienst Germany | SP Power3 375 MHz 16 way IBM | 1280 | 2001 | 1404 | 1920 |
| 36 | CINECA Italy | pSeries 690 Turbo 1.3GHz IBM | 512 | 2002 | 1384 | 2662.4 |
| 37 | NCAR (National Center for Atmospheric Research) United States | SP Power3 375 MHz 16 way IBM | 1260 | 2001 | 1382 | 1890 |
| 38 | University of Toronto Canada | PowerRACK-HX dual Xeon 2.4 GHz - SMC GigE Self-made | 512 | 2003 | 1202 | 2457 |
| 39 | Lawrence Livermore National Laboratory United States | SP Power3 375 MHz 16 way IBM | 1088 | 2001 | 1193 | 1632 |
| 40 | Osaka University Japan | SX-5/128M8 3.2ns NEC | 128 | 2001 | 1192 | 1280 |
| 41 | National Centers for Environmental Prediction United States | SP Power3 375 MHz IBM | 1104 | 2000 | 1179 | 1656 |
| 42 | CSC (Center for Scientific Computing) Finland | pSeries 690 1.1GHz IBM | 512 | 2002 | 1170 | 2253 |
| 43 | Florida State University United States | pSeries 690 1.1GHz IBM | 512 | 2002 | 1170 | 2253 |
| 44 | Government United States | T3E1200 Cray Inc. | 1900 | 2001 | 1166 | 2280 |
| 45 | ERDC MSRC United States | T3E1200/900 Cray Inc. | 1792 | 1999 | 1166 | 1999 |
| 46 | Energy Company (D) United States | Cluster Platform 6000 rx5670 Itanium2 900 MHz Cluster - GigE Hewlett-Packard | 545 | 2002 | 1090 | 1962 |
| 47 | Nestec S.A. Switzerland | pSeries 690 Turbo 1.3GHz IBM | 400 | 2003 | 1081 | 2080 |
| 48 | Compagnie Generale de Geophysique (CGG) United States | PowerEdge 1750, P4 Xeon 3.06 GHz, GigE Dell | 1024 | 2003 | 1068 | 6266.88 |
| 49 | Cornell Theory Center United States | PowerEdge 2650 Cluster P4 Xeon 2.4 GHz/MSWindows - GigE Dell | 384 | 2002 | 1068 | 1843.2 |
| 50 | Indiana University United States | AVIDD-B+AVIDD-I - xSeries Cluster Xeon 2.4 GHz - Myrinet&Force10 IBM | 384 | 2003 | 1058 | 1843 |
| 51 | Academy of Mathematics and System Science China | DeepComp 1800 - P4 Xeon 2 GHz - Myrinet lenovo | 512 | 2002 | 1046 | 2048 |
| 52 | Applera/Celera Genomics United States | pSeries 690 Turbo 1.3GHz IBM | 384 | 2002 | 1038 | 1996.8 |
| 53 | HLRN at Universitaet Hannover / RRZN Germany | pSeries 690 Turbo 1.3GHz IBM | 384 | 2002 | 1038 | 1996.8 |
| 54 | HLRN at ZIB/Konrad Zuse-Zentrum fuer Informationstechnik Germany | pSeries 690 Turbo 1.3GHz IBM | 384 | 2002 | 1038 | 1996.8 |
| 55 | University of Southern California United States | Netfinity Cluster P4 Xeon 2 GHz - Myrinet IBM | 512 | 2003 | 1028 | 2048 |
| 56 | Seoul National University Korea, South | Pegasus P4 Xeon Cluster 2.2/2.4/2.8 GHz - Giganet - MSWindows Self-made | 400 | 2002 | 1011 | 1843 |
| 57 | Argonne National Laboratory United States | Jazz - LCRC Xeon 2.4 GHz - Myrinet Linux Networx | 361 | 2002 | 1007 | 1732.8 |
| 58 | Japan Atomic Energy Research Institute Japan | AlphaServer SC40, 833 MHz Hewlett-Packard | 812 | 2002 | 1007 | 1352.8 |
| 59 | Sandia National Laboratories United States | CPlant/Ross Cluster Self-made | 1800 | 2002 | 996.9 | 1782.5 |
| 60 | NEC Fuchu Plant Japan | SX-6/128M16 NEC | 128 | 2002 | 982 | 1024 |
| 61 | National Supercomputer Centre (NSC) Sweden | Pentium Xeon Cluster 2.2 GHz - SCI 3D Self-made | 400 | 2002 | 960.4 | 1760 |
| 62 | UCSD/San Diego Supercomputer Center United States | SP Power3 375 MHz 8 way IBM | 1152 | 2000 | 929 | 1728 |
| 63 | High Energy Accelerator Research Organization /KEK Japan | SR8000-F1/100 Hitachi | 100 | 2000 | 917 | 1200 |
| 64 | Compagnie Generale de Geophysique (CGG) United Kingdom | xSeries Cluster Xeon 2.4 GHz - Gig-E IBM | 1100 | 2003 | 894.9 | 5280 |
| 65 | Arizona State University/TGEN United States | xSeries Cluster Xeon 2.4 GHz - Gig-E IBM | 1048 | 2003 | 894.9 | 5030.4 |
| 66 | TotalFinaElf France | xSeries Cluster Xeon 2.4 GHz - Gig-E IBM | 1024 | 2003 | 894.9 | 4915.2 |
| 67 | SG SGBI France | xSeries Cluster Xeon 2.4 GHz - Gig-E IBM | 968 | 2003 | 894.9 | 4646.4 |
| 68 | GX Technology United States | xSeries Cluster Xeon 2.4 GHz - Gig-E IBM | 880 | 2003 | 894.9 | 4224 |
| 69 | US Army HPC Research Center at NCS United States | T3E1200 Cray Inc. | 1084 | 2000 | 892 | 1300.8 |
| 70 | Maui High-Performance Computing Center (MHPCC) United States | SP Power3 375 MHz 16 way IBM | 812 | 2001 | 891 | 1218 |
| 71 | Maui High-Performance Computing Center (MHPCC) United States | pSeries 690 Turbo 1.3GHz IBM | 320 | 2002 | 887.3 | 1664 |
| 72 | Pennsylvania State University United States | LION-XL - PowerEdge 2650 Cluster P4 Xeon 2.4 GHz - Quadrics Dell | 256 | 2003 | 877.9 | 1228.8 |
| 73 | University of Tokyo Japan | SR8000/128 Hitachi | 128 | 1999 | 873 | 1024 |
| 74 | ERDC MSRC United States | emerald - AlphaServer SC45, 1 GHz Hewlett-Packard | 512 | 2002 | 862.2 | 1024 |
| 75 | Hewlett-Packard United States | AlphaServer SC45, 1 GHz Hewlett-Packard | 512 | 2002 | 862.2 | 1024 |
| 76 | Wright-Patterson Air Force Base/DoD ASC United States | AlphaServer SC45, 1 GHz Hewlett-Packard | 512 | 2002 | 862.2 | 1024 |
| 77 | NASA/Ames Research Center/NAS United States | ORIGIN 3000 600 MHz SGI | 1024 | 2002 | 852.9 | 1228.8 |
| 78 | Los Alamos National Laboratory United States | Grendels - Grendels P4 Cluster 2.4 GHz - Myrinet Linux Networx | 252 | 2003 | 840.5 | 1209.6 |
| 79 | Australian Partnership for Advanced Computing (APAC) Australia | AlphaServer SC45, 1 GHz Hewlett-Packard | 508 | 2002 | 825.5 | 1016 |
| 80 | Universitaet Heidelberg - IWR Germany | HELICS AMD 1.4 GHz - Myrinet Megware | 512 | 2002 | 825 | 1433.6 |
| 81 | Government United States | T3E900 Cray Inc. | 1324 | 1997 | 815 | 1191.6 |
| 82 | UCSD/San Diego Supercomputer Center United States | TeraGrid Cluster Itanium 2 1 GHz - Myrinet IBM | 252 | 2003 | 798.3 | 1008 |
| 83 | Charles Schwab United States | SP Power3 375 MHz IBM | 768 | 2000 | 795 | 1152 |
| 84 | Rutgers University, Department of Physics & Astronomy United States | AMD AthlonMP Cluster 1.65 GHz Self-made | 512 | 2003 | 794 | 1690 |
| 85 | Institute for Materials Research/Tohoku University Japan | SR8000-G1/64 Hitachi | 64 | 2001 | 790.7 | 921.6 |
| 86 | GSIC Center, Tokyo Institute of Technology Japan | Presto III Athlon 1.6 GHz Self-made | 486 | 2002 | 788.8 | 1555.2 |
| 87 | Ohio Supercomputer Center United States | Cluster Platform 6000 zx6000 Itanium2 900 MHz, Myrinet Hewlett-Packard | 256 | 2003 | 761.9 | 921.6 |
| 88 | Los Alamos National Laboratory United States | Space Simulator, P4 2.53 GHz - GigEth Self-made | 288 | 2002 | 757.1 | 1457 |
| 89 | Media & Entertainment (C) United States | pSeries 690 Turbo 1.3GHz IBM | 264 | 2002 | 755 | 1372.8 |
| 90 | North Carolina Supercomputing Center (NCSC) United States | SP Power3 375 MHz IBM | 720 | 2000 | 741 | 1080 |
| 91 | IBM United States | pSeries 690 Turbo 1.3GHz IBM | 256 | 2002 | 736.6 | 1331.2 |
| 92 | IBM United States | pSeries 690 Turbo 1.3GHz IBM | 256 | 2002 | 736.6 | 1331.2 |
| 93 | National Center for High Performance Computing Taiwan | pSeries 690 Turbo 1.3GHz IBM | 256 | 2002 | 736.6 | 1331.2 |
| 94 | Swiss Scientific Computing Center (CSCS) Switzerland | pSeries 690 Turbo 1.3GHz IBM | 256 | 2002 | 736.6 | 1331.2 |
| 95 | Joint Supercomputer Center Russia | MVS1000M EV67 667 MHz Self-made | 768 | 2002 | 734.6 | 1024 |
| 96 | University of Tsukuba Japan | VPP5000/80 Fujitsu | 80 | 2001 | 730 | 768 |
| 97 | Oak Ridge National Laboratory United States | SP Power3 375 MHz IBM | 704 | 2000 | 723 | 1056 |
| 98 | LASG/Institute of Atmospheric Physics, CAS China | DeepComp 1800 - P4 Xeon 2.4 GHz - Myrinet lenovo | 256 | 2002 | 711.7 | 1228 |
| 99 | NCSA United States | pSeries 690 Turbo 1.3GHz GigEth IBM | 384 | 2003 | 708 | 1996.8 |
| 100 | Texas Advanced Computing Center/Univ. of Texas United States | Longhorn - pSeries p690/p655 1.3GHz IBM | 224 | 2002 | 704.8 | 1164.8 |