Quote Originally Posted by Manel View Post
gtj, you really dig into this deep man.
I started reading hardware manuals for fun in 1970.

Anyway, the diodes are there for the internal shutdown logic and in the ICH9's case, it's actually a basic environment sensor and fan controller for lower end motherboards that don't have separate sensor chips.

The cpu, mch and ich can all signal an overheat which would cause the system to shut down.