GeForce 256 Game Requirement Analysis
GeForce 256 was, technically, the world's first GPU as it was the first single GPU "with integrated transform, lighting, triangle setup/clipping, and rendering engines that is capable of processing a minimum of 10 million polygons per second" - according to NVIDIA.
It's manufactured with a 220nm technology and offers 4 Pixel Shaders (not to be confused with today's Shader Processing Units), 4 TMUs and 4 ROPs, on a 128-bit interface of DDR. The central unit runs at 120MHz and the memory clock operates at 166MHz.
Obviously, none of today's games are playable.