A Cray supercomputer at the Oak Ridge National Laboratory is the world’s fastest machine, toppling an IBM machine from the No. 1 position.

The TOP 500 List report issued Monday says the Cray “Titan” is the fastest on its latest in a twice-annual report.

The Titan is a Cray XK7 system, and it achieved a whopping 17.59 petaflops (quadrillions of calculations per second).

IBM’s BlueGene/Q system at the Lawrence Livermore National Laboratory had been first. Named Sequoia, it crunched 16.32 petaflops.

Rankings are based on a benchmark known as the Linpack.

The Titan has 560,640 processors, including 261,632 NVIDIA K20X accelerator cores.

The Sequoia runs on 1.572 million cores and was the first to have more than 1 million, according to the TOP 500 report.

The rest of the top five:

  • Fujitsu’s K computer installed at the RIKEN Advanced Institute for Computational Science (AICS) in Kobe, Japan (No. 3);
  • BlueGene/Q system named Mira at Argonne National Laboratory (No. 4)
  • BlueGene/Q system named JUQUEEN at the Forschungszentrum Juelich in Germany (No. 5)

The TOP 500 report noted that 23 supercomputers now run at petaflop speeds. The first petaflop computer debuted 41/2 years ago.

IBM employs some 10,000 people across North Carolina.

[IBM ARCHIVE: Check out 10 years of IBM stories as reported in WRAL Tech Wire.]