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Now, researchers from Shanghai Jiao Tong University and Tsinghua University in China have demonstrated an all-optical chip they call LightGen that is more than 100 times faster and more energy efficient than a leading Nvidia GPU on tasks like video and image generation. Founded: not yet a company Market cap: zero

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Arm Holdings plc is a British semiconductor and software design company based in Cambridge, England, whose primary business is the design of central processing unit (CPU) cores that implement the ARM architecture family of instruction sets.
Founded: 1990
Market cap: $117bn