| Rank | Site | Computer/Year Vendor | Cores | Rmax | Rpeak | Power | | 1 | DOE/NNSA/LANL United States | Roadrunner - BladeCenter QS22/LS21 Cluster, PowerXCell 8i 3.2 Ghz / Opteron DC 1.8 GHz , Voltaire Infiniband / 2008 IBM | 122400 | 1026.00 | 1375.78 | 2345.50 |
| 2 | DOE/NNSA/LLNL United States | BlueGene/L - eServer Blue Gene Solution / 2007 IBM | 212992 | 478.20 | 596.38 | 2329.60 |
| 3 | Argonne National Laboratory United States | Blue Gene/P Solution / 2007 IBM | 163840 | 450.30 | 557.06 | 1260.00 |
| 4 | Texas Advanced Computing Center/Univ. of Texas United States | Ranger - SunBlade x6420, Opteron Quad 2Ghz, Infiniband / 2008 Sun Microsystems | 62976 | 326.00 | 503.81 | 2000.00 |
| 5 | DOE/Oak Ridge National Laboratory United States | Jaguar - Cray XT4 QuadCore 2.1 GHz / 2008 Cray Inc. | 30976 | 205.00 | 260.20 | 1580.71 |
| 6 | Forschungszentrum Juelich (FZJ) Germany | JUGENE - Blue Gene/P Solution / 2007 IBM | 65536 | 180.00 | 222.82 | 504.00 |
| 7 | New Mexico Computing Applications Center (NMCAC) United States | Encanto - SGI Altix ICE 8200, Xeon quad core 3.0 GHz / 2007 SGI | 14336 | 133.20 | 172.03 | 861.63 |
| 8 | Computational Research Laboratories, TATA SONS India | EKA - Cluster Platform 3000 BL460c, Xeon 53xx 3GHz, Infiniband / 2008 Hewlett-Packard | 14384 | 132.80 | 172.61 | 786.00 |
| 9 | IDRIS France | Blue Gene/P Solution / 2008 IBM | 40960 | 112.50 | 139.26 | 315.00 |
| 10 | Total Exploration Production France | SGI Altix ICE 8200EX, Xeon quad core 3.0 GHz / 2008 SGI | 10240 | 106.10 | 122.88 | 442.00 |
| 11 | Government Agency Sweden | Cluster Platform 3000 BL460c, Xeon 53xx 2.66GHz, Infiniband / 2007 Hewlett-Packard | 13728 | 102.80 | 146.43 | |
| 12 | NNSA/Sandia National Laboratories United States | Red Storm - Sandia/ Cray Red Storm, Opteron 2.4 GHz dual core / 2007 Cray Inc. | 26569 | 102.20 | 127.53 | |
| 13 | EDF R&D France | Frontier2 BG/L - Blue Gene/P Solution / 2008 IBM | 32768 | 92.96 | 111.41 | 252.00 |
| 14 | IBM Thomas J. Watson Research Center United States | BGW - eServer Blue Gene Solution / 2005 IBM | 40960 | 91.29 | 114.69 | 448.00 |
| 15 | NERSC/LBNL United States | Franklin - Cray XT4, 2.6 GHz / 2007 Cray Inc. | 19320 | 85.37 | 100.46 | 1150.00 |
| 16 | Information Technology Center, The University of Tokyo Japan | T2K Open Supercomputer (Todai Combined Cluster) - Hitachi Cluster Opteron QC 2.3 GHz, Myrinet 10G / 2008 Hitachi | 12288 | 82.98 | 113.05 | 638.60 |
| 17 | Stony Brook/BNL, New York Center for Computational Sciences United States | New York Blue - eServer Blue Gene Solution / 2007 IBM | 36864 | 82.16 | 103.22 | 403.20 |
| 18 | ECMWF United Kingdom | Power 575, p6 4.7 GHz, Infiniband / 2008 IBM | 8320 | 80.32 | 156.42 | 1329.70 |
| 19 | RZG/Max-Planck-Gesellschaft MPI/IPP Germany | VIP - Power 575, p6 4.7 GHz, Infiniband / 2008 IBM | 6720 | 80.32 | 126.34 | 1073.99 |
| 20 | Center for Computational Sciences, University of Tsukuba Japan | T2K Open Supercomputer - Appro Xtreme-X3 Server - Quad Opteron Quad Core 2.3 GHz, Infiniband / 2008 Appro International | 10000 | 76.46 | 92.00 | 671.80 |
| 21 | DOE/NNSA/LLNL United States | ASC Purple - eServer pSeries p5 575 1.9 GHz / 2006 IBM | 12208 | 75.76 | 92.78 | 1992.96 |
| 22 | Rensselaer Polytechnic Institute, Computational Center for Nanotechnology Innovations United States | eServer Blue Gene Solution / 2007 IBM | 32768 | 73.03 | 91.75 | 358.40 |
| 23 | NCSA United States | Abe - PowerEdge 1955, 2.33 GHz, Infiniband, Windows Server 2008/Red Hat Enterprise Linux 4 / 2007 Dell | 9600 | 68.48 | 89.59 | |
| 24 | GSIC Center, Tokyo Institute of Technology Japan | TSUBAME Grid Cluster with CompView TSUBASA - Sun Fire x4600/x6250 Cluster, Opteron 2.4/2.6 GHz and ClearSpeed Accelerator, Xeon E5440 2.833 GHz, Infiniband / 2008 NEC/Sun | 12344 | 67.70 | 109.73 | |
| 25 | NASA/Ames Research Center/NAS United States | Columbia - SGI Altix 1.5/1.6/1.66 GHz, Voltaire Infiniband / 2008 SGI | 13824 | 66.57 | 82.94 | |
| 26 | Barcelona Supercomputing Center Spain | MareNostrum - BladeCenter JS21 Cluster, PPC 970, 2.3 GHz, Myrinet / 2006 IBM | 10240 | 63.83 | 94.21 | |
| 27 | Leibniz Rechenzentrum Germany | HLRB-II - Altix 4700 1.6 GHz / 2007 SGI | 9728 | 56.52 | 62.26 | 990.24 |
| 28 | ERDC MSRC United States | Cray XT4 QuadCore 2.1 GHz / 2008 Cray Inc. | 8464 | 56.25 | 71.10 | |
| 29 | University of Edinburgh United Kingdom | HECToR - Cray XT4, 2.8 GHz / 2007 Cray Inc. | 11328 | 54.65 | 63.44 | |
| 30 | NCAR (National Center for Atmospheric Research) United States | bluefire - Power 575, p6 4.7 GHz, Infiniband / 2008 IBM | 4064 | 54.08 | 76.40 | 649.51 |
| 31 | NNSA/Sandia National Laboratories United States | Thunderbird - PowerEdge 1850, 3.6 GHz, Infiniband / 2006 Dell | 9024 | 53.00 | 64.97 | |
| 32 | Commissariat a l'Energie Atomique (CEA) France | Tera-10 - NovaScale 5160, Itanium2 1.6 GHz, Quadrics / 2006 Bull SA | 9968 | 52.84 | 63.80 | |
| 33 | Wright-Patterson Air Force Base/DoD ASC United States | Altix 4700 1.6 GHz / 2007 SGI | 9216 | 51.44 | 58.98 | |
| 34 | Kyoto University Japan | T2K Open Supercomputer/Kyodai - Fujitsu Cluster HX600, Opteron Quad Core, 2.3 GHz, Infiniband / 2008 Fujitsu | 6656 | 50.51 | 61.24 | |
| 35 | IBM/ECMWF United States | Power 575, p6 4.7 GHz, Infiniband / 2008 IBM | 3520 | 47.97 | 66.18 | 562.57 |
| 36 | Moscow State University - Research Computing Center Russia | SKIF MSU - T-Platforms T60, Intel Quadcore 3Mhz, Infiniband DDR / 2008 SKIF/T-Platforms | 5000 | 47.17 | 60.00 | 265.00 |
| 37 | IBM - Rochester United States | Blue Gene/P Solution / 2007 IBM | 16384 | 46.83 | 55.71 | 126.00 |
| 38 | Texas Advanced Computing Center/Univ. of Texas United States | Lonestar - PowerEdge 1955, 2.66 GHz, Infiniband / 2007 Dell | 5848 | 46.73 | 62.22 | |
| 39 | HPC2N - Umea University Sweden | Akka - BladeCenter HS21 Cluster, Xeon QC HT 2.5 GHz, IB, Windows HPC 2008/CentOS / 2008 IBM | 5376 | 46.04 | 53.76 | 173.21 |
| 40 | National Supercomputer Centre (NSC) Sweden | Cluster Platform 3000 DL140 Cluster, Xeon 2.33GHz Infiniband / 2007 Hewlett-Packard | 6400 | 44.46 | 59.65 | |
| 41 | Maui High-Performance Computing Center (MHPCC) United States | Jaws - PowerEdge 1955, 3.0 GHz, Infiniband / 2006 Dell | 5200 | 42.39 | 62.40 | |
| 42 | Commissariat a l'Energie Atomique (CEA) France | CEA-CCRT-Platine - Novascale 3045, Itanium2 1.6 GHz, Infiniband / 2007 Bull SA | 7680 | 42.13 | 49.15 | |
| 43 | US Army Research Laboratory (ARL) United States | Michael J. Muuss Cluster (MJM) - Evolocity II (LS Supersystem) Xeon 51xx 3.0 GHz IB / 2007 Linux Networx | 4416 | 40.61 | 52.99 | |
| 44 | R-Systems United States | R Smarr - Dell DCS CS23-SH, QC HT 2.8 GHz, Infiniband / 2008 Dell | 4608 | 39.58 | 51.61 | |
| 45 | Gdansk University of Technology, CI Task Poland | Galera - ACTION Cluster Xeon E5345 Infiniband / 2008 ACTION | 5336 | 38.17 | 49.73 | |
| 46 | Forschungszentrum Juelich (FZJ) Germany | JUBL - eServer Blue Gene Solution / 2006 IBM | 16384 | 37.33 | 45.88 | 179.20 |
| 47 | University of Bergen Norway | Cray XT4 QuadCore 2.3 GHz / 2008 Cray Inc. | 5548 | 36.87 | 51.04 | |
| 48 | Lawrence Livermore National Laboratory United States | Atlas - Appro Xtreme Server - Quad Opteron Dual Core 2.4GHz Infiniband / 2007 Appro International | 9216 | 36.62 | 44.24 | |
| 49 | The Earth Simulator Center Japan | Earth-Simulator / 2002 NEC | 5120 | 35.86 | 40.96 | |
| 50 | ERDC MSRC United States | Sapphire - Cray XT3, 2.6 GHz dual Core / 2006 Cray Inc. | 8192 | 35.20 | 42.60 | |
| 51 | ASTRON/University Groningen Netherlands | Blue Gene/P Solution / 2008 IBM | 12288 | 35.12 | 41.78 | 94.50 |
| 52 | RZG/Max-Planck-Gesellschaft MPI/IPP Germany | Genius - Blue Gene/P Solution / 2008 IBM | 12288 | 35.12 | 41.78 | 94.50 |
| 53 | Turboinstitute Slovenia | BladeCenter HS21 Cluster, Xeon QC HT 3 GHz, Infiniband / 2008 IBM | 4096 | 35.08 | 49.15 | 191.08 |
| 54 | Louisiana Optical Network Initiative United States | Queen Bee - PowerEdge 1950, 2.33 GHz, Infiniband / 2007 Dell | 5440 | 34.78 | 50.77 | |
| 55 | Atomic Weapons Establishment United Kingdom | Cray XT3, 2.6 GHz dual Core / 2006 Cray Inc. | 7812 | 33.93 | 40.62 | |
| 56 | Joint Supercomputer Center Russia | Cluster Platform 3000 BL460c, Xeon 53xx 3GHz, Infiniband / 2007 Hewlett-Packard | 3760 | 33.89 | 45.12 | 418.83 |
| 57 | National Institute for Computational Sciences/University of Tennessee United States | Kraken - Cray XT3, 2.6 GHz dual Core / 2008 Cray Inc. | 7482 | 32.83 | 38.91 | |
| 58 | Max-Planck-Gesellschaft MPI/Albert-Einstein-Institut Germany | ATLAS - Pyramid Cluster Xeon QC 32xx 2.4 GHz, GigEthernet / 2008 Pyramid Computer | 5420 | 32.80 | 52.03 | 201.00 |
| 59 | NASA/Ames Research Center/NAS United States | SGI Altix ICE 8200, 2.66 GHz / 2007 SGI | 4096 | 32.52 | 43.58 | |
| 60 | Harvard University - FAS Research Computing United States | Odyssey - PowerEdge M600 Cluster, Xeon E5410 2.3Ghz, Infiniband / 2008 Dell | 4096 | 32.41 | 38.17 | |
| 61 | University of Tromso Norway | Cluster Platform 3000 BL460c, Xeon 53xx 2.66GHz, GigEthernet / 2007 Hewlett-Packard | 5632 | 31.86 | 59.92 | |
| 62 | Clemson University United States | Palmetto - PowerEdge 1950, Quad Core 2.33 GHz, Myrinet 10G / 2008 Dell | 4096 | 31.06 | 38.17 | |
| 63 | University of Southern California United States | HPC - PowerEdge 1950, Quad Core 3.2 GHz, Myrinet 10G / 2008 Dell | 4096 | 30.99 | 52.43 | |
| 64 | Logistic Services (E) United States | Cluster Platform 3000 BL460c, Xeon 54xx 3.0GHz, GigEthernet / 2008 Hewlett-Packard | 4584 | 29.37 | 55.01 | 510.61 |
| 65 | HWW/Universitaet Stuttgart Germany | BladeCenter HS21 Cluster, Xeon QC HT 2.83 GHz, Infiniband / 2008 IBM | 3424 | 29.32 | 38.76 | 137.61 |
| 66 | University of Bristol United Kingdom | BlueCrystal - xSeries x3450 Cluster Xeon quad core, 2.8 GHz, Infiniband / 2008 ClusterVision/IBM | 3360 | 28.78 | 37.63 | 135.03 |
| 67 | University of North Carolina United States | Topsail - PowerEdge 1955, 2.33 GHz, Cisco/Topspin Infiniband / 2007 Dell | 4160 | 28.77 | 38.82 | |
| 68 | ASTRON/University Groningen Netherlands | Stella - eServer Blue Gene Solution / 2005 IBM | 12288 | 27.45 | 34.41 | 134.40 |
| 69 | Lawrence Livermore National Laboratory United States | Minos - Appro Xtreme Server - Quad Opteron Dual Core 2.4GHz Infiniband / 2007 Appro International | 6912 | 27.38 | 33.18 | |
| 70 | CSC (Center for Scientific Computing) Finland | Cray XT4 QuadCore 2.3 GHz / 2008 Cray Inc. | 4032 | 26.80 | 37.09 | |
| 71 | HLRN at Universitaet Hannover / RRZN Germany | SGI Altix ICE 8200EX, Xeon quad core 3.0 GHz / 2008 SGI | 2560 | 26.69 | 30.72 | 129.20 |
| 72 | HLRN at ZIB/Konrad Zuse-Zentrum fuer Informationstechnik Germany | SGI Altix ICE 8200EX, Xeon quad core 3.0 GHz / 2008 SGI | 2560 | 26.69 | 30.72 | 129.20 |
| 73 | SARA (Stichting Academisch Rekencentrum) Netherlands | Power 575, p6 4.7 GHz, Infiniband / 2008 IBM | 1536 | 23.47 | 28.88 | 245.48 |
| 74 | DOE/Oak Ridge National Laboratory United States | Blue Gene/P Solution / 2007 IBM | 8192 | 23.42 | 27.85 | 63.00 |
| 75 | Stony Brook/BNL, New York Center for Computational Sciences United States | New York Blue - Blue Gene/P Solution / 2008 IBM | 8192 | 23.42 | 27.85 | 63.00 |
| 76 | National Astronomical Observatory of Japan Japan | Cray XT4 QuadCore 2.2 GHz / 2008 Cray Inc. | 3248 | 22.74 | 28.58 | |
| 77 | Caltech United States | CITerra - PowerEdge 1950, 2.33 GHz, Myrinet / 2007 Dell | 4096 | 22.59 | 37.70 | |
| 78 | Intel United States | Endeavor - Intel Cluster, Xeon E54xx, 2.8 GHz, Infiniband / 2008 Intel | 2296 | 21.81 | 25.72 | |
| 79 | Indiana University United States | Big Red - BladeCenter JS21 Cluster, PPC 970, 2.5 GHz, Myrinet / 2007 IBM | 3072 | 21.79 | 30.72 | |
| 80 | Holland Computing Center at PKI United States | Firefly - PowerEdge SC1435 Dual core Opteron 2.8 GHz, Infiniband / 2007 Dell | 4604 | 21.50 | 25.78 | |
| 81 | Audi AG Germany | Cluster Platform 3000 BL460c, Xeon 51xx 3.0GHz, Infiniband DDR / 2008 Hewlett-Packard | 2432 | 20.95 | 29.18 | |
| 82 | Government Classified United States | Cluster Platform 6000 rx1620, Itanium2 1.6 GHz, Quadrics / 2007 Hewlett-Packard | 4096 | 20.45 | 26.21 | |
| 83 | Naval Oceanographic Office (NAVOCEANO) United States | eServer pSeries p5 575 1.9 GHz / 2006 IBM | 3072 | 20.07 | 23.35 | |
| 84 | IBM Advanced Client Technology Center United States | eServer pSeries p5 575 1.9 GHz / 2007 IBM | 3072 | 20.07 | 23.35 | |
| 85 | University of Reading United Kingdom | BladeCenter JS21 Cluster, PPC 970, 2.5 GHz, Myrinet / 2008 IBM | 2800 | 20.05 | 28.00 | |
| 86 | NOAA R&D/ National Centers for Environmental Prediction United States | Power 575, p6 4.7 GHz, Infiniband / 2008 IBM | 1312 | 20.05 | 24.67 | 209.68 |
| 87 | Cray Inc. United States | Cray XT5 QC 2.3 GHz / 2008 Cray Inc. | 2848 | 20.02 | 26.20 | |
| 88 | Cardiff University - ARCCA United Kingdom | Merlin - Novascale R422 Cluster, Xeon E5472, 3.00 GHz, Infiniband / 2008 Bull SA | 2048 | 20.00 | 24.58 | |
| 89 | Lawrence Livermore National Laboratory United States | Thunder - Intel Itanium2 Tiger4 1.4GHz - Quadrics / 2004 California Digital Corporation | 4096 | 19.94 | 22.94 | |
| 90 | CINECA Italy | BladeCenter HS21 Cluster, Xeon dual core 3.0 GHz, Infiniband / 2007 IBM | 5120 | 19.91 | 61.44 | 488.24 |
| 91 | National Center for High Performance Computing Taiwan | xSeries x3550 Cluster Xeon, 3 GHz, Infiniband / 2007 IBM | 2080 | 19.91 | 24.96 | 193.44 |
| 92 | Energy Company (G) United States | Cluster Platform 3000 BL460c, Xeon 54xx 3.0GHz, GigEthernet / 2008 Hewlett-Packard | 3072 | 19.79 | 36.86 | 342.19 |
| 93 | Energy Company (G) United States | Cluster Platform 3000 BL460c, Xeon 54xx 3.0GHz, GigEthernet / 2008 Hewlett-Packard | 3072 | 19.79 | 36.86 | 342.19 |
| 94 | Energy Company (G) United States | Cluster Platform 3000 BL460c, Xeon 54xx 3.0GHz, GigEthernet / 2008 Hewlett-Packard | 3072 | 19.79 | 36.86 | 342.19 |
| 95 | Energy Company (G) United States | Cluster Platform 3000 BL460c, Xeon 54xx 3.0GHz, GigEthernet / 2008 Hewlett-Packard | 3072 | 19.79 | 36.86 | 342.19 |
| 96 | CERN Switzerland | NOW Cluster - Intel Xeon 53xx, 2.33 GHz, GigEthernet / 2008 Self-made | 3760 | 19.69 | 35.04 | |
| 97 | SGI United States | SGI Altix ICE 8200, 3.0 GHz / 2007 SGI | 2048 | 19.36 | 24.58 | |
| 98 | Universität Ulm/ Universität Konstanz Germany | BladeCenter HS21 Cluster, Xeon QC HT 2.83 GHz, Infiniband / 2008 IBM | 2240 | 19.18 | 25.36 | 90.03 |
| 99 | University College London (UCL) United Kingdom | PowerEdge 1950, Xeon 51xx 3.06 GHz, Infinipath / 2008 ClusterVision/Dell | 1992 | 18.93 | 24.38 | 330.00 |
| 100 | Universitaet Aachen/RWTH Germany | PRIMERGY RX200 S4 Cluster, Quad Core 3Ghz, Infiniband, Windows HPC 2008 / 2008 UNICORNER/Fujitsu-Siemens | 2048 | 18.81 | 24.58 | |