I think your question is best answered by the vSphere 6 HCL. The Atom 2700 series is not on it.
For the second question on the controller, I can't be 100% certain, but based on the support and performance of other on board controllers; I would say it's a no go.
That said, just because it's not supported... doesn't mean it won't work.
Thank you, Zach.