I was curious what the consensus is regarding questions on SO about a specific capability of a certain library/API/SDK. For example: "Can Amazon AWS perform X in Y fashion" type questions. What I'm speaking of is mostly theoretical questions rather than actual code problems. Should these types of questions be on SO or Programmers.StackExchange.com
If you are talking about more conceptual, whiteboard type of problems, I'd go with Programmers. These would be more theoretical, not usually involving actual code in the question. From the Intro to Programmers page:
In a nutshell, Stack Overflow is for when you’re front of your compiler or editor working through code issues. Programmers is for when you’re in front of a whiteboard working through higher level conceptual programming issues.
Keep in mind though that these questions should be applicable to all programmers. I don't have the dance venn diagram with me, but stay away from very localized questions.