As anyone tried the Crucial Ballistix memory stick with speed 1866/7, or any other brand with the same speed 1866/7 and with a total of 16GB RAM...32GB RAM?
To be clear, are you saying that putting the Kingston Hyper X - 1867 in the late 2012 Mac Mini achieved only a 1600 speed? Also wondered why it would work in the 2011 Mac Mini!
these sticks have been thoroughly tested. the kingston 1866 really works on a 2011 mini due to the sandy bridge cpu. apple does not allow it to work on the 2012 mini. there are old threads with real demos and examples that show a 2011 running at 1866 speed.
BTW most work does not benefit with 1866 but a handful of stuff is quicker.