The MB was returned, with BIOS upgraded to 3.9.
After reassembling the PC, I was still not able to set the memory frequency to 3200 MHz.
Spent a little time with tech support, and they walked me thru their website's specification about memory with the 7 2700x (pinnacle) CPU. With 4 slots (4x16gb), the best I can hope for is 2667. I was not able to get that.
I removed 2x16 leaving only 32 gb in place and set the frequency to 3200 Mhz and it stayed.
I think I am going to leaving it at 32 gb because I haven't seen any of my application requiring more than 32 gb.
I am going to test the most demanding program (Davinci Resolve) tomorrow and see if there is any better than 2133 Mhz.
Next time I am going to build another pc, I am going to pay a lot more attention to the MB.