"August 31, 1999 marks the introduction of the Graphics Processing Unit (GPU) for the PC industry. The technical definition of a GPU is "a single chip processor with integrated transform, lighting, triangle setup/clipping, and rendering engines that is capable of processing a minimum of 10 million polygons per second."
following this definition, for me it was the Geforce 2 mx 400
following this definition, for me it was the Geforce 2 mx 400