Where does these values come from ?

My qs are as follows;
1. how does the motherboard calculates the rpm of fan(s)
2. the votages are given like this +5V, +12V etc and these start from
zero thats wht i think. but the motherboard show from -3.22V to +5 V.
my qs is if the negative side increases does it have some kinda of
effect on the overall voltage? (voltage diff is increasing but max +5V
remains same)
bye

"Aamir" wrote in message

My qs are as follows;
1. how does the motherboard calculates the rpm of fan(s)

there is a hardware monitor chip on the mobo type ITE8705/12F etc.
it reports temperatures and fan rpms

2. the votages are given like this +5V, +12V etc and these start from
zero thats wht i think. but the motherboard show from -3.22V to +5 V.
my qs is if the negative side increases does it have some kinda of
effect on the overall voltage? (voltage diff is increasing but max +5V
remains same)
bye

forget the negative voltage values - it's mostly incorrect metered
only the positive voltage values are correctly metered

Hi "Aamir"


1. how does the motherboard calculates the rpm of fan(s)

Fans with 3 wires have what is called a Tachogenerator on them, chips on the
motherboard use this signal to report RPM from the motor.

2. the votages are given like this +5V, +12V etc and these start from
zero thats wht i think. but the motherboard show from -3.22V to +5 V.
my qs is if the negative side increases does it have some kinda of
effect on the overall voltage? (voltage diff is increasing but max +5V
remains same)

Any unwelcome voltage change spells trouble.


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