DIGI+ VRM Settings.
The X370 offers much more in the BIOS for overclocking, a greater range of settings then a B350 board as well as a better VRM. A better VRM translates into a more stable power supply, fewer fluctuations resulting in great stability. Frequency settings on VDDCR CPU Switching Frequency and VDDCR SOC Switching Frequency to 300, a higher frequency tends to be a waste of power. VDDCR CPU Current Capability, VDDCR SOC Current Capability, in short, how much power it can draw over the baseline to 130%. VDDCR CPU Load Line Calibration, VDDCR SOC Power Phase Control set to extreme. VDDCR CPU Load Line Calibration, VDDCR SOC Load Line Calibration set to level 3, higher or lower resulted in instability in my case yours could be different. These settings are the best for my chip, especially the Line Calibration settings vary from chip to chip if you are close to stable make changes here.