The GameCube, Wii, and Wii U all use the same basic setup: PowerPC G3 CPU and an ATi/AMD GPU with an upgrade each generation. They are, in effect, very similar to how the PS4 and Xbox One started their own current trends. In fact, the Wii U can run GameCube games natively with some effort, and Wii games out of the box.
The GameCube, Wii, and Wii U all use the same basic setup: PowerPC G3 CPU and an ATi/AMD GPU with an upgrade each generation. They are, in effect, very similar to how the PS4 and Xbox One started their own current trends. In fact, the Wii U can run GameCube games natively with some effort, and Wii games out of the box.