This document from Intel covers CoD mode (Pg. 28) and optimal DIMM sizes (Pg. 37), etc. https://drive.google.com/file/d/0B21tKtZ3UOQNdWtJZW9XekFCZ3M...
You should also disable C-States (e.g. lock to C0) - https://rhsummit.files.wordpress.com/2013/06/shak-jeder-summ... covers the performance impact of CPU states.