The only thing that proves what I said is these prints. Whether OSX supports it or not, it seems to me it supports. And as I said, it takes the maximum RAM speed and increases the GB score if I select XMP in Profile 1. With XMP disabled, it shows only the base speed 2333Mhz and the GB obviously decreases!
Can you post your extended GB changes pre and post XMP?
I have always been curious about the impact.