For the first time, Chinese-designed semiconductors have come to power the world's fastest supercomputer. It's a breakthrough for China's attempts to reduce dependence on imported technology. At the same time, it challenges US technology dominance. The Sunway TaihuLight supercomputer, located at the state-funded Chinese Supercomputing Center in Wuxi, Jiangsu province, is more than twice as powerful as the previous winner, according to TOP500, a research organization that compiles the rankings twice a year. The machine is powered by a SW26010 processor designed by Shanghai High-Performance IC Design Center, TOP500 said Monday. "It's not based on an existing architecture. They built it themselves," said Jack Dongarra, a professor at the University of Tennessee and creator of the measurement method used by TOP500. "This is a system that has Chinese processors."