This Gauge32 is the high-water mark for uncorrected SMI-link errors on this CPU recorded during the trailing 15-minute window. An admin uses 15MinH to confirm whether that processor's memory interconnect had any uncorrected error activity within the last 15 minutes, even if the count has since stopped incrementing. For example, a nonzero 15MinH with a now-zero current rate still indicates a serious event occurred recently that needs investigation.