C# volatile variable: Memory fences VS. caching

Question

So I researched the topic for quite some time now, and I think I understand the most important concepts like the release and acquire memory fences.

Howe

Answer 1

Yes, volatile is about fences and fences are about ordering. So when? is not in the scope and is actually an implementation detail of all the layers (compiler, JIT, CPU etc.) combined, but every implementation should have decent and practical answer to the question.