I just got 6x 16 GB Samsung PC3-14900R 1866 MHz RAM 2Rx4 for my Mac Pro 2012 (in order to move 4 of them to a new Mac Pro in future). The funny thing is when I put my old 2x 8 GB Kingston PC3-10600R 1333 MHz 2Rx4 in slot 4 and 8 it also works together giving a total of 112 GB RAM. OWC says it's not possible, but actually it is. I don't see any lower results when using Dual vs Triple Channel. Is there any benchmark clearly showing this ?