I'm writing this on a Core M. It really doesn't feel like 800MHz. Compiling stuff might be a bit slower, but the main performance bottleneck in most modern PCs

I'm writing this on a Core M. It really doesn't feel like 800MHz. Compiling stuff might be a bit slower, but the main performance bottleneck in most modern PCs seems to be disk IO anyway, rather than raw processing speed. If you're doing video rendering, or using a bloaty IDE etc. then you might need something more powerful. For general use though, a Core M is completely fine.