Where does these values come from ?

[Guest]

Archived from groups: alt.comp.periphs.mainboard.gigabyte (More info?)

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

 

[Guest]

Archived from groups: alt.comp.periphs.mainboard.gigabyte (More info?)

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.


--


(º·.?(?*·.? ?.·*?)?.·º)
«.·°·. Steve .·°·.»
(?.·º(?.·?* *?·.?)º·.?)

 

[Guest]

Archived from groups: alt.comp.periphs.mainboard.gigabyte (More info?)

"Aamir" <aamirsq_001@yahoo-dot-com.no-spam.invalid> wrote in message
news:41da8782$1_5@alt.athenanews.com
> 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