The labels on the picture of the motherboard in the manual appear to be incorrect. If you look at the actual motherboard you will see that. Use XMM1 and XMM2 (the 2 slots with the WHITE TABS). That is your Primary Memory Bank. Two EXACTLY MATCHED DIMMs in those two slots should run Dual-Channel just fine. The chart itself is correct.
I replaced the oem ram with Corsair Vengeance ddr4 32000, and 2x16gb. According to my system, it's being ran in single channel. I put them in the first two slots, tried slot 1 and 3 but it didn't even recognize the second chip when I did that. How do u get it to run dual channel? 
Aurora R9, can't get dual channel