> the LM90 only allows 1 smbus adress and thus there can not be 2 Yeah, you're perfectly right. Not having the data sheet before my eyes, I had almost forgotten that detail. That may explain why they are using the switching trick instead of using two monitoring chips. That said, they obviously should have used a LM83 instead. -- Jean Delvare http://www.ensicaen.ismra.fr/~delvare/