bonkers325 how about giving us the specs of the 5 machines and info regarding the setup, the irq's the os and oc'ing settings ? Maybe we
could spot why you have no problems with hardware thermal monitoring.
If you have a visit at the Asus newsgroup you'd probably see at least a dozen posts regarding hardware monitoring problems, so i guess its either got to do with some particular setup / circumstances or the asus quality control made a couple of errors.