Make sure your uncore clock (UCLK) is running at least double the DDR rating of the memory. In order to do this you'll need to increase it's multiplier to double whatever you are using for the memory. Giving QPI/VTT voltage a small bump may also be necessary.
...rightful liberty is unobstructed action according to our will within limits drawn around us by the equal rights of others. I do not add 'within the limits of the law,' because law is often but the tyrant's will, and always so when it violates the right of an individual. -- Thomas Jefferson