Nvidia reached a historic $4 trillion market capitalisation, making it the world's most valuable company by benefiting from massive demand for AI training chips. The company's graphics processing units (GPUs), originally designed for PC gaming and 3D rendering, turned out to be perfect for training AI models due to their parallel processing capabilities. This coincidental overlap between gaming graphics technology and AI requirements has transformed Nvidia from a gaming hardware company into the dominant supplier for AI data centres, with shares rising 50% as companies like those run by Elon Musk stuff their facilities with Nvidia chipsets.