| Subsystem | SMBus Function | v5 Improvement Over v4 | |-----------|----------------|----------------------------| | Main CPU voltage regulator (VRM) | Telemetry readout (current, temp) + dynamic voltage scaling | Faster fault recovery on overcurrent events | | Battery gauge (if portable) | Reporting State‑of‑Charge, voltage, cycle count | Added support for 2‑wire crypto authentication (SHA‑256) | | Rear I/O thermal sensors (3x) | Overtemperature alerts, fan speed table lookup | Noise‑filtered interrupts (debounce logic) | | EEPROM (board configuration) | Serial presence detect for RAM modules | Expanded block write to 64 bytes per transaction |