A Japanese computer has taken first place on the Top 500 supercomputer list, ending China's reign at the top after just six months. At 8.16 petaflops (quadrillion floating-point calculations per second), the K computer is more powerful than the next five systems combined.
The K computer's performance was measured using 68,544 SPARC64 VIIIfx CPUs each with eight cores, for a total of 548,352 cores, almost twice as many as any other system on the Top500 list. The computer is still under construction, and when it enters service in November 2012 will have more than 80,000 SPARC64 VIIIfx CPUs according to its manufacturer, Fujitsu.
Unlike other recent supercomputers, the K computer doesn't use graphics processors or other accelerators. It uses the most power, but is also one of the most energy-efficient systems on the list, according to Top500.org.
Source : Japan takes back first place on Top 500 supercomputer list - Computerworld
Amazing feat, considering the recent tragedy that hit Japan.