I'm sorry yes, I meant Rampage 3 Formula.
My problem I've figured out is that it's not ALWAYS recognizing the 24GB. I can be in the BIOS and it will recognize 24GB at 1600Mhz, then restart and go into the BIOS and not its only 16GB. I've now heard that the whole i7 9xx series is having problems like this.
I've tried exactly what you said and it happens just the same.. once in a great while it will decide to see all 24GB. It's too late to take my RAM back to get a set that is on the QVL.. not that it would even matter.