The world's top 20 computers

Rank
Country
Computer
Year
Peak speed in gigaflops
1
United States
BlueGene/L - eServer Blue Gene Solution
(IBM)
2007
596378
2
Germany
JUGENE - Blue Gene/P Solution
(IBM)
2007
222822
3
United States
SGI Altix ICE 8200,
Xeon quad core 3.0 GHz
(SGI)
2007
172032
4
India
Cluster Platform 3000 BL460c, Xeon 53xx 3GHz, Infiniband
(Hewlett-Packard)
2007
170880
5
Sweden
Cluster Platform 3000 BL460c, Xeon 53xx 2.66GHz, Infiniband
(Hewlett-Packard)
2007
146430
6
United States
Red Storm - Sandia/ Cray Red Storm, Opteron 2.4 GHz dual core
(Cray Inc.)
2007
127531
7
United States
Jaguar - Cray XT4/XT3
(Cray Inc.)
2006
119350
8
United States
BGW - eServer Blue Gene Solution
(IBM)
2005
114688
9
United States
Franklin - Cray XT4, 2.6 GHz
(Cray Inc.)
2007
100464
10
United States
New York Blue - eServer Blue Gene Solution
(IBM)
2007
103219
11
United States
ASC Purple - eServer pSeries p5 575 1.9 GHz
(IBM)
2006
92781
12
United States
eServer Blue Gene Solution
(IBM)
2007
91750
13
Spain
MareNostrum - BladeCenter JS21 Cluster, PPC 970, 2.3 GHz, Myrinet
(IBM)
2006
94208
14
United States
Abe - PowerEdge 1955, 2.33 GHz, Infiniband
(Dell)
2007
89587.2
15
Germany
HLRB-II - Altix 4700 1.6 GHz
(SGI)
2007
62259.2
16
Japan
TSUBAME Grid Cluster
- Sun Fire x4600 Cluster, Opteron 2.4/2.6 GHz and ClearSpeed Accelerator, Infiniband
(NEC/Sun)
2007
102021
17
United Kingdom
HECToR - Cray XT4, 2.8 GHz
(Cray Inc.)
2007
63436.8
18
United States
Thunderbird - PowerEdge 1850, 3.6 GHz, Infiniband
(Dell)
2006
64972.8
19
France
Tera-10 - NovaScale 5160, Itanium2 1.6 GHz, Quadrics
(Bull SA)
2006
63795.2
20
United States
Columbia - SGI Altix 1.5 GHz, Voltaire Infiniband
(SGI)
2004
60960
A gigaflop is a measure of computing speed equal to one billion floating-point operations (or calculations) per second.
Source: Top500.org
For the full list of the world's top 500 computers, click here