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Six I/O system boards are installed in each rack. Each board contains 4 SPARC64 VIIIfx CPUs with 8 cores integrated into each chip. The board delivers a performance to power ratio of 2.2 gigaflops per watt.
Here's a look at the pieces of the water cooling system for the K Computer.
The 6-dimensional mesh/torus topography is described by Fujitsu:
"The design of the 6-dimensional mesh/torus topology in the K computer means there are many communication routes between neighboring CPUs. This enables the execution of data communications between CPUs via the shortest route and over the shortest period of time and ensures the network can fully draw out this world top-class CPU computational power."