The IBM BlueGene/Q system, named
Sequoia, is installed at the Department of Energy’s Lawrence Livermore National Laboratory and hit 16.32 petaflop/s on the Linpac
k benchmark [FONT=inherit !important][FONT=inherit !important][/FONT][/FONT]using 1,572,864 cores. It's also one of the most energy efficient systems on the list.