Japan’s research institution RIKEN once again captured the top spot on the Green500 list with its Shoubu supercomputer, the most energy-efficient system in the world. With rating of 6673.84 MFLOPS/Watt, Shoubu edged out another RIKEN system, Satsuki, the number 2 system that delivered 6195.22 MFLOPS/Watt. Both are “ZettaScaler”supercomputers, employing Intel Xeon processors and PEZY-SCnp manycore accelerators. The 3rd most energy-efficient system is China’s Sunway TaihuLight, which currently holds the number 1 spot on the TOP500 list as the world’s fastest supercomputer. It is powered solely by Sunway’s SW26010 processors and represents the first homogenous supercomputer in the top 10 of the Green500 since a set of IBM Blue Gene/Q systems occupied six of the top 10 spots in June 2013. The Satsuki and TaihuLight supercomputers are the only new entries in the top 10. Overall, there are 157 new systems in the June 2016 edition of the Green500, representing nearly a third of the list. Aside from those systems mentioned, the remaining seven supercomputers in the top 10 use GPUs as accelerators paired with Xeon CPUs. The most energy-efficient systems continue to be dominated by heterogeneous systems like these. In the current list, 40 of the top 50 systems employ some sort of accelerator. Read more at https://www.hpcwire.com/off-the-wire/rikens-shoubu-supercomputer-captures-top-spot-green500-list/