Asus Zenith Extreme
Team Group Nighthawk 3200MHz CL16-18-18-36, 64GB, 16GB sticks, dual rank, Samsung B die
RX Vega 64 x2
EVGA Platinum 850w (MB)
EVGA Platinum 1200w (GPU)
I can post in triple channel, even at rated speed. It is not the Dimm as I have changed them all out.
I had this exact set up including same memory and MB post 3066 quad with zero tweaking, just set it to DCOP 3066, but different processor. It would not post at 3200.
I have a similar problem with quad channel memory, but fortunately able to post (and even reaching 2933 speeds).
However compared to the exact same memory modules in a X370 platform (where these modules work without a problem with full speed (3200) - after AGESA 188.8.131.52) it is still a far cry.
You can observe this thread here: