Who would've guessed that 18 of the top 20 most energy efficient supercomputers on the planet are built with IBM hardware? Let's be honest, who wouldn't have guessed it? This isn't the first time IBM has dominated the Green500 list, which includes a range of energy efficient supercomputers all around the globe, but it's hard not to be impressed that the company holds 69 of the top 100 positions on the list.

"Supercomputers can no longer focus only on raw performance. The era of simply adding more processors is coming to a close," said David Turek, vice president, deep computing, IBM. "Clients need to be able to run supercomputers anywhere, not only places that have cheap power. As the Green500 proves, IBM has focused on this issue for some time and is well positioned to usher in performance breakthroughs along with efficiency gains."

IBM also claims the most energy efficient system in the world with a supercomputer built at the Julich supercoming center in Germany. The machine is capable of producing more than 732 Mflops per watt of energy.

IBM's Roadrunner system at the U.S. Department of Energy's Los Alamos National Laboratory in New Mexico is no longer the planet's most powerful supercomputer. That distinction now belongs to a Cray supercomputer named "Jaguar" at Oak Ridge National Laboratory, which regained the performance crown over the weekend, ComputerWorld reports.

Jaguar, which benefited from a few recent upgrades, is now capable of 1,759 petaflops per second courtesy of 224,162 processor cores. That's enough to jump ahead of IBM's Roadrunner, which dropped to 1,042 petaflops per second after it was repartitioned.

Number three on the list of supercomputers is Kraken at the National Institute for Computational Sciences at the University of Tennessee. Kraken is capable of churning out 832 teraflops per second and was ranked No. 6 in June.

One of the more interesting supercomputers belongs to China. The hybrid Intel-AMD Tianhe-1 in the city of Tianjin pushes out 563 teraflops per second, putting it in fifth place. China's supercomputer combines Intel's Xeon processors with AMD-brand GPUs as accelerators. Each node contains two Xeon chips attached to two AMD GPUs.

Fujitsu this week laid a humdinger on Intel by unveiling the world's fastest CPU. The new chip is thought to be about 2.5 times faster than anything Intel has in its lineup, while also consuming two-thirds less power.

You can put any grandiose ideas of picking one up and setting new benchmarking records to rest, as the 'Venus' chip, or otherwise known as the SPARC64 VIIIfx, is designed for supercomputers. As such, Fujitsu claims the new CPU can process a mind boggling 128 billion computations per second, making Fujitsu the first Japanese firm in a decade to wear the raw CPU performance crown.

Built on a 45nm manufacturing process, Venus comes with eight cores and an integrated memory controller spread across two square centimeters. Fujitsu says it will take several years to come up with practical applications for the new chip, but that it could see use in pharmaceutical research, astronomy, weather prediction, scientific researching, and Folding@Home while running Crysis (we may have added the last two on our own).