Thermal Throttling
Die temperature events that cause clock frequency drops — often indicating cooling or power delivery design issues that won't appear until sustained workload stress.
THERMAL_EVENTCLK_THROTTLETJ_MAXTURBO_ABORT
Power Rail Anomalies
Core voltage drops, VRM instability, and VCCIN irregularities that fall outside the golden reference behavioral envelope — silent killers in high-core-count Xeon designs.
VOLTAGE_DROPVRM_FAULTVCCIN_ANOMPOWER_LIMIT
Microarchitecture Deviations
Cache miss rate shifts, instruction stall patterns, and IPC deviations from the reference workload signature — early signals of LLC, memory controller, or bus interconnect issues.
CACHE_MISSINSTR_STALLIPC_DROPMEM_LAT