Depending on what the timings are, you may need to raise some voltages to achieve stability.
What I might try is setting your ram manually since it likely won't work with X.M.P.
In the bios on the Extreme Tweaker tab, try manually setting:
Dram Frequency - 5600MHz
Dram VDD voltage - 1.35v
Dram VDDQ voltage - 1.35v
CPU System Agent voltage - 1.25v - 1.30v
At the bottom, Advanced Memory voltages
IVR Transmitter VDDQ voltage - 1.35v
CPU Memory Controller voltage - 1.25v - 1.30v
Sync All PMIC's
Dram Timing Control
Enter the primary timings like so:
34
40
40
84
Command Rate 2N
F10 and Enter to save and exit.
If it boots, this will give you a starting point.
