I’m not sure what you mean here. The GPU is a specialized parallel compute element, it doesn’t do general purpose calculations with complex branch conditions ve

I’m not sure what you mean here. The GPU is a specialized parallel compute element, it doesn’t do general purpose calculations with complex branch conditions very well. That’s why it can be so massively parallel. The CPU conversely does comparatively well with branching and arbitrary memory loads. The examples you give are gaming machines, so the programs on the CPU, especially on older machines, are based around video interrupts to facilitate smooth graphics. It’s a program choice on the CPU.