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Tianhe-2

Computer
Tianhe-2 or TH-2 is a 3.86-petaflops supercomputer located in the National Supercomputer Center in Guangzhou, China. It was developed by a team of 1,300 scientists and engineers. Wikipedia
Architecture: 32 Intel Xeon E5-2692 12C with 2.200 GHz 4,000 Xeon Phi 31S1P
Cost: 2.4 million Yuan (US$390,000)
Memory: 15 TiB (1,000 TiB CPU and 375 TiB coprocessor)
Operating system: Kylin Linux
Power: 1.6 MW (24 MW with cooling)
Purpose: Simulation, analysis, and government security applications