Decode CPU ladders in HWMonitor
Package averages throttle the chip; per-core spikes tell you if paste or mounting is uneven.
Anchor on package first
Find the CPU group, note the package row, and compare it with what BIOS fan curves reference.
Hunt core skew
Expand cores: if one diode sits ~10°C above siblings under load, remount the cooler before chasing voltage tweaks.