The drastic decrease in the power consumption per computation capacity is also an advantage in terms of cost. The cost for the entire system and the basic maintenance cost for four years amount to ¥3.2 billion (approx US$35 million), which is low.

While the normal cost to introduce a supercomputer is about ¥10 million per 1 TFLOPS, the cost to introduce the Tsubame 2.0 is about ¥3 million per 1 TFLOPS.

The cost does not include electricity costs, which are about ¥100 million per year. If the electricity costs increased in the same ratio as the computation capacity, they could be up to ¥2.5 billion per year.

Matsuoka said that the university plans to introduce the Tsubame 3.0, a successor to the Tsubame 2.0, in fiscal 2014 or fiscal 2015 and has already started to develop it.

"We are aiming at around 30 PFLOPS, but the power consumption of the Tsubame 3.0 will be equivalent to or less than that of the Tsubame 2.0," he said.