United Kingdom
In November 2003, 33 systems appeared in the TOP500 list.
| Rank | System | Procs | Memory(GB) | Rmax (GFlops) | Rpeak (GFlops) | Vendor |
|---|---|---|---|---|---|---|
| 16 | pSeries 690 Turbo 1.3GHz | 1280 | N/A | 3406 | 6656 | IBM |
| 23 | pSeries 690 Turbo 1.3GHz | 960 | N/A | 2560 | 4992 | IBM |
| 24 | pSeries 690 Turbo 1.3GHz | 960 | N/A | 2560 | 4992 | IBM |
| 36 | SP Power3 375 MHz 16 way | 1920 | N/A | 2106 | 2880 | IBM |
| 52 | xSeries Cluster Xeon 2.4 GHz - Gig-E | 1100 | N/A | 1755 | 5280 | IBM |
| 86 | PowerEdge 650, 3.06 GHz, Gig Ethernet | 940 | N/A | 1212 | 5752.8 | Dell |
| 99 | SGI Altix 1.3 GHz | 256 | N/A | 1142 | 1331.2 | SGI |
| 123 | BladeCenter Cluster Xeon 2.8 GHz, Gig-Ethernet | 520 | N/A | 1028.08 | 2912 | IBM |
| 138 | SX-6/120M15 | 120 | N/A | 927.6 | 960 | NEC |
| 139 | SX-6/120M15 | 120 | N/A | 927.6 | 960 | NEC |
| 144 | xSeries Cluster Xeon 2.4 GHz - Myrinet | 320 | N/A | 921.491 | 1536 | IBM |
| 170 | xSeries Cluster Xeon 2.4 GHz - Gig-E | 376 | N/A | 806.78 | 1804.8 | IBM |
| 202 | SGI Altix 1.3 GHz | 152 | N/A | 697.481 | 790.4 | SGI |
| 210 | T3E1200 | 812 | N/A | 671 | 974.4 | Cray Inc. |
| 293 | T3E900 | 876 | N/A | 552 | 788.4 | Cray Inc. |
| 306 | SuperDome 875 MHz/HyperPlex | 256 | N/A | 530.5 | 896 | HP |
| 318 | T3E1200 | 636 | N/A | 526 | 763.2 | Cray Inc. |
| 324 | SuperDome 875 MHz/HyperPlex | 256 | N/A | 517 | 896 | HP |
| 338 | Cluster Platform DL360G3, Pentium4 Xeon 2.8 GHz, Myrinet | 128 | N/A | 511 | 716.8 | HP |
| 339 | Cluster Platform DL360G3, Pentium4 Xeon 2.8 GHz, Myrinet | 128 | N/A | 511 | 716.8 | HP |
| 358 | SuperDome 875 MHz/HyperPlex | 224 | N/A | 479.5 | 784 | HP |
| 364 | SuperDome 875 MHz/HyperPlex | 224 | N/A | 468.1 | 784 | HP |
| 365 | Fire 15K 1.05 GHz | 300 | N/A | 468.1 | 630 | Sun |
| 366 | Fire 15K 1.05 GHz | 300 | N/A | 468.1 | 630 | Sun |
| 367 | Fire 15K 1.05 GHz | 300 | N/A | 468.1 | 630 | Sun |
| 383 | SuperDome 750 MHz/HyperPlex | 256 | N/A | 449.4 | 768 | HP |
| 400 | SuperDome 750 MHz/HyperPlex | 256 | N/A | 432.6 | 768 | HP |
| 401 | SuperDome 750 MHz/HyperPlex | 256 | N/A | 432.6 | 768 | HP |
| 419 | SuperDome 875 MHz/HyperPlex | 192 | N/A | 421 | 672 | HP |
| 429 | SuperDome 875 MHz/HyperPlex | 192 | N/A | 418.1 | 672 | HP |
| 448 | SuperDome 875 MHz/HyperPlex | 192 | N/A | 412.7 | 672 | HP |
| 451 | SuperDome 875 MHz/HyperPlex | 192 | N/A | 412.7 | 672 | HP |
| 486 | SuperDome 875 MHz/HyperPlex | 192 | N/A | 408.2 | 672 | HP |