
CPU_FAN vs. CPU_OPT: Key Differences and Where to Plug In
Misallocation between CPU_FAN and CPU_OPT headers results in non-negotiable threats to silicon integrity. CPU_FAN is hard-coded for synchronous RPM monitoring and shutdown protocols, directly tied to CPU thermal failsafe routines in UEFI/BIOS. CPU_OPT, by contrast, behaves as a passive auxiliary header—lacking mandatory interrupt-driven monitoring, often mapped to secondary control lines















