With overclocked ram there can be issues that you only see 4gb not 6gb, adjusting the QPI voltage and Ram voltage can normally fix things.
This does not answer your query directly but I guess it will help.
Intel hosts live chat event with their experts where people can discuss Intel products technologies. The next event will be held around their core processors. I think that it will be a good platform to ask this or any other question. The next event is on 26th March at 9:30 am GMT. More info at