The degradation over time sounds absurd to me given that all temperature data that Level1techs observed in the logs was mid 80s max on W series mobos. There should be virtually no degradation even after 5+ years 24/7 full load. Unless heat spreader causing hot spot on die not detected by a sensor? It will be most interesting what it turns out to be. Turn down the clocks, disable e-cores, can still happen. Downclock the DDR5, possible fix, .. but lower binned chips often/usually use the same silicon (memory controller) as the high-end which has this problem, just disabled components.