I did a CPU comparison of my putt putt Athlon X4 740 against a Ryzen 5 1600. One thing that surprised me was that the Ryzen apparently lacks all those custom instruction sets like SSE and MMX etc. Then I read this: https://en.wikipedia.org/wiki/Streaming_SIMD_Extensions which suggests that most people never used those, although some small percentage of scientists perhaps do. I know that crypto currency mining has turned towards using the GPU rather than the CPU for heavy computation. I don't have a specific question about it, I just think it's interesting (and kinda sad) that Intel and AMD put a lot of effort into something that was supposed to provide some competitive advantage and (almost) nobody ever bothered to use it.