Hi friend. How are you? Hope so.Since i also had problems getting the Infinity Fabric Clock FCLK past the 1800 i figured i try a little harder and did plenty of experimenting over the last days. I noticed the same WHEA errors at first, too. What helped me (and and others according to reports from other forums) raising the SOC Voltage over 1.15V helped me to completely eliminate the WHEA errors. I also adjusted the NB Loadline Calibration to avoid dropping the SOC Voltage under Load, but i don't know if that was necessary.
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In your ZenTimings Screenshot i noticed your Ram Voltage being on the low side as well, i would have guessed that it would take at least over 1.36V to get to DDR4-3733?
I updated the bios yesterday, with Agesa 184.108.40.206 and the WHEA errors decreased by 80%. Despite being a much better and more stable bios, few WHEA errors continued to appear. My memory (Samsung C Die) doesn't scale well with high voltage, if it goes up too high it gives an error. Only with your tip to raise the SOC voltage to 1.15 that totally resolved these errors. I didn't have to adjust the Loadline, just going up the voltage resolved. Now there is no more WHEA error. Maybe I can even get my memory up. Thank you very much for the tip, it solved my problem.